[11:47:17] EX2104_DIVE07 ROV powered off [11:52:36] dhugallindsay leaves the room [12:02:44] DIVE07 test message from the Okeanos Explorer [12:45:45] EX2104_DIVE07 ROV Launch [12:55:58] EX2104_DIVE07 ROV on Surface [12:57:21] EX2104_DIVE07 ROV Descending [12:58:35] LAT : 35.890192 , LON : -51.523677 , DEPTH : 21.5714 m, TEMP : 22.58608 C, SAL : 36.48278 PSU, DO : 7.31765 mg/l [13:03:36] LAT : 35.889384 , LON : -51.52326 , DEPTH : 72.6386 m, TEMP : 19.79845 C, SAL : 36.65186 PSU, DO : 7.0731 mg/l [13:08:37] LAT : 35.888543 , LON : -51.522857 , DEPTH : 223.2957 m, TEMP : 18.70409 C, SAL : 36.6229 PSU, DO : 6.99798 mg/l [13:13:38] LAT : 35.887755 , LON : -51.522621 , DEPTH : 373.233 m, TEMP : 18.31431 C, SAL : 36.57062 PSU, DO : 7.00407 mg/l [13:18:38] LAT : 35.887561 , LON : -51.522599 , DEPTH : 523.4676 m, TEMP : 17.13798 C, SAL : 36.34616 PSU, DO : 6.52007 mg/l [13:19:00] kiramizell leaves the room [13:23:38] LAT : 35.887644 , LON : -51.522667 , DEPTH : 674.3062 m, TEMP : 14.44383 C, SAL : 35.89199 PSU, DO : 5.69088 mg/l [13:28:39] LAT : 35.887688 , LON : -51.522691 , DEPTH : 829.8955 m, TEMP : 10.65202 C, SAL : 35.3638 PSU, DO : 4.82345 mg/l [13:33:40] LAT : 35.887634 , LON : -51.522788 , DEPTH : 980.2488 m, TEMP : 8.51022 C, SAL : 35.20926 PSU, DO : 5.35736 mg/l [13:38:40] LAT : 35.88764 , LON : -51.522781 , DEPTH : 1138.5981 m, TEMP : 6.40255 C, SAL : 35.12469 PSU, DO : 6.71887 mg/l [13:43:41] LAT : 35.887584 , LON : -51.522861 , DEPTH : 1283.5399 m, TEMP : 5.90087 C, SAL : 35.16111 PSU, DO : 7.20719 mg/l [13:48:41] LAT : 35.887564 , LON : -51.522931 , DEPTH : 1437.2328 m, TEMP : 4.99676 C, SAL : 35.0588 PSU, DO : 7.83564 mg/l [13:49:59] faesapsford leaves the room [13:51:07] hello everyone [13:51:18] Good (time zome appropraiate moniker) everyone [13:52:00] good morning/afternoon/evening everyone [13:52:07] radiolarian in cam2 [13:52:27] oik [13:53:42] LAT : 35.887574 , LON : -51.522918 , DEPTH : 1582.7475 m, TEMP : 4.48532 C, SAL : 35.01207 PSU, DO : 8.1649 mg/l [13:54:29] coelodendrid phaeodendrians [13:54:36] phaeodarians [13:54:50] in fission [13:56:15] oik [13:58:39] ~~ 20 minutes to bottom [13:58:43] LAT : 35.88749 , LON : -51.522863 , DEPTH : 1733.8921 m, TEMP : 4.33956 C, SAL : 35.01289 PSU, DO : 8.22575 mg/l [13:58:58] faesapsford leaves the room [13:59:52] Johndeitz leaves the room [14:00:02] looks like a fair bit of biomass. Just not able to ID things because of speed and jumpy feed. Lots of food for the benthos I would imagine. [14:01:19] We were thinking that here too Dhugal, we can certainly hope...:) [14:03:18] scottfrance leaves the room [14:03:42] LAT : 35.887472 , LON : -51.522868 , DEPTH : 1886.8102 m, TEMP : 4.18215 C, SAL : 35.00204 PSU, DO : 8.23684 mg/l [14:08:43] LAT : 35.887489 , LON : -51.522882 , DEPTH : 2034.7356 m, TEMP : 4.00666 C, SAL : 34.98893 PSU, DO : 8.23006 mg/l [14:09:22] coronate medusa? [14:09:56] kimberlygalvez leaves the room [14:10:30] Are the guyots in the Corner region turning out to be similar depths? Would indicate the features are potenitally ~~contemporanous. [14:11:00] kelseyviator leaves the room [14:12:45] There's about ~~1500m inbetween them, so depends on the definition of similar [14:13:17] kelseyviator leaves the room: Replaced by new connection [14:13:25] That's a sizeable enough difference it indicate they likely didn't form and subside contemporanously. Thanks [14:13:44] LAT : 35.887377 , LON : -51.522846 , DEPTH : 2187.5804 m, TEMP : 3.79462 C, SAL : 34.97953 PSU, DO : 8.18147 mg/l [14:15:08] Those that we have been working on the last few days do appear to be connected by (perhaps) rift arms, so from that perspective, there is someoverall connection, just not sure if it is temporal [14:17:49] Yeah, that's the interesting part about the Corner Rise area. They seem interconnected but don't follow plate motion clearly in the east. [14:18:32] Wonder if there are pulses of volcanism like what is found at Atlantis-Meteor area (33 -17Ma) [14:18:44] LAT : 35.887301 , LON : -51.522844 , DEPTH : 2335.8314 m, TEMP : 3.66532 C, SAL : 34.97141 PSU, DO : 8.22974 mg/l [14:20:22] quite possible [14:22:51] ~~ 150 m to bottom [14:23:45] LAT : 35.887196 , LON : -51.522759 , DEPTH : 2495.8175 m, TEMP : 3.44945 C, SAL : 34.95976 PSU, DO : 8.24303 mg/l [14:27:48] kimberlygalvez leaves the room [14:28:45] LAT : 35.887605 , LON : -51.52225 , DEPTH : 2537.1539 m, TEMP : 3.38137 C, SAL : 34.95701 PSU, DO : 8.21769 mg/l [14:28:59] fish [14:29:12] 60m off bottom [14:31:16] bottom in sight [14:31:20] bottom in sight [14:32:40] EX2104_DIVE07 ROV on Bottom [14:33:45] LAT : 35.887712 , LON : -51.522322 , DEPTH : 2583.5912 m, TEMP : 3.32617 C, SAL : 34.95477 PSU, DO : 8.17278 mg/l [14:38:14] Intereesting that there are these large smooth rock features and no life on them [14:38:46] LAT : 35.8876 , LON : -51.522014 , DEPTH : 2591.0301 m, TEMP : 3.33026 C, SAL : 34.95451 PSU, DO : 8.21417 mg/l [14:39:49] was just about to say no botyroidal textures....and then there they are [14:40:10] kimberlygalvez leaves the room [14:40:24] looks like thick FeMn but hard to tell [14:41:36] Wonder if it's flat carbonate platform that slumped down and is now smoothly encrusted [14:43:47] LAT : 35.887619 , LON : -51.521903 , DEPTH : 2594.0132 m, TEMP : 3.32662 C, SAL : 34.95338 PSU, DO : 8.22777 mg/l [14:44:23] Good place for FeMn mining I guess, if you can recover the crust [14:44:30] @kevin, on the lookout for carbonat-ish type textures, we might still be a little deep [14:48:47] LAT : 35.887669 , LON : -51.52183 , DEPTH : 2591.6167 m, TEMP : 3.31872 C, SAL : 34.95395 PSU, DO : 8.19791 mg/l [14:51:14] Need a mantis shrimp arm attachment so we can bust up an rock and see the interior :) [14:52:46] we will certainly have to work for a rock today [14:53:47] LAT : 35.887696 , LON : -51.521955 , DEPTH : 2591.3101 m, TEMP : 3.32947 C, SAL : 34.95338 PSU, DO : 8.246 mg/l [14:57:01] carolynruppel leaves the room [14:58:48] LAT : 35.88765 , LON : -51.521715 , DEPTH : 2588.7548 m, TEMP : 3.31485 C, SAL : 34.95362 PSU, DO : 8.24435 mg/l [14:59:07] pretty [15:02:55] kimberlygalvez leaves the room [15:03:48] LAT : 35.887897 , LON : -51.521551 , DEPTH : 2586.0707 m, TEMP : 3.31642 C, SAL : 34.95466 PSU, DO : 8.21306 mg/l [15:04:26] Good effort, thanks [15:05:00] kelseyviator leaves the room [15:06:07] Sponge was likely a demosponge possibly in the genus Pyloderma [15:06:33] urchin may be in the family Echinidae [15:08:49] LAT : 35.887847 , LON : -51.52148 , DEPTH : 2585.9378 m, TEMP : 3.32331 C, SAL : 34.95418 PSU, DO : 8.1921 mg/l [15:11:53] davidvousden leaves the room [15:13:31] If they are both loose the fatter one to right might be better. [15:13:50] LAT : 35.887888 , LON : -51.521379 , DEPTH : 2586.1389 m, TEMP : 3.32695 C, SAL : 34.95559 PSU, DO : 8.16596 mg/l [15:14:55] Pure crust, can we try the other one [15:15:03] kelseyviator leaves the room [15:16:47] Surprisingly white on the interior of the crust sample. Maybe carbonate or phosphorite coating [15:16:58] we are going to zoom [15:18:21] Grab it [15:18:50] LAT : 35.887823 , LON : -51.521423 , DEPTH : 2587.6984 m, TEMP : 3.33339 C, SAL : 34.95374 PSU, DO : 8.163 mg/l [15:18:59] We can try for a rock at the talus slope on the cliff. Maybe some exposed basalt there. [15:19:44] We'll keep an eye out Kevin [15:20:41] Good job [15:20:59] rhianwaller leaves the room: Replaced by new connection [15:23:50] LAT : 35.887907 , LON : -51.52121 , DEPTH : 2585.4809 m, TEMP : 3.33216 C, SAL : 34.95537 PSU, DO : 8.22283 mg/l [15:24:28] jocelyncooper leaves the room [15:25:30] Branching is opposite so yes, a Bathypathes I think [15:26:00] peterauster leaves the room [15:26:43] gammarid amphipod [15:26:57] well looks lkke its alternate but still bathypathes since that genus can have both I believe [15:27:31] Where's Tina or Scott when you need them? [15:27:48] quite a few of them swimming between the branches [15:28:15] I think there is at least a polychaete, can't tell what the really small ones are [15:28:35] @Chris - right? [15:28:51] LAT : 35.888076 , LON : -51.52123 , DEPTH : 2588.2213 m, TEMP : 3.3279 C, SAL : 34.95439 PSU, DO : 8.22374 mg/l [15:29:28] Black coral polyps have 6 tentacles, 2 of which are much larger than the other 4. In the closeup, you see series of polyps with the 2 larger tentacles showing but not the others which are too small to see [15:29:54] davidvousden leaves the room [15:30:18] Possibly in the family Echinidae [15:31:08] this is a rossellid vase [15:32:06] Members of this family often look a bit "dirty" because spicule axes sticking out tend to trap debris [15:32:42] Halosaur [15:33:29] Not such a wild guess Kim. I think Peter called these Halosauropsis sp [15:33:52] LAT : 35.888027 , LON : -51.521062 , DEPTH : 2586.8816 m, TEMP : 3.32835 C, SAL : 34.95484 PSU, DO : 8.17981 mg/l [15:33:59] It got a bit munched [15:35:11] weird pedestal of some kind [15:36:12] funny it is so round [15:36:20] Looks like a shallow carbonate reef structure. Wonder if came down slope [15:36:49] fish [15:38:28] Argh! Keep locking up and losing connectivity! [15:38:52] LAT : 35.888154 , LON : -51.521163 , DEPTH : 2583.1494 m, TEMP : 3.32897 C, SAL : 34.95378 PSU, DO : 8.1619 mg/l [15:38:53] There's a lot of marine snow in this area! [15:38:59] The fish was an ophidiid or cusk eel. Trying to remember name which could be Cetonurus [15:39:23] Halosauropsis most likely for first one, Ophidiid cusk eel for the second ... [15:40:21] thanks @Peter, added the names to the associated annotations [15:42:00] Peter, could the ophidiid have been Typhlonus? [15:42:16] carolynruppel leaves the room [15:42:49] Can't find a picture of what I was trying to remember [15:43:20] Would it be helpful to collect the fossilized cup coral to carbon date it? [15:43:28] Polychaete palpal tentacles extending from a tube [15:43:52] @Jocelyn: we did collect some yesterday for that purpose [15:43:53] LAT : 35.888084 , LON : -51.521106 , DEPTH : 2578.8264 m, TEMP : 3.32869 C, SAL : 34.9547 PSU, DO : 8.2026 mg/l [15:44:20] @scott ok great! [15:45:35] @chris ... just got a fleeting glimpse ... will look at the images later/tommorrow. We saw Cetonurus ... I think ... out here on 2005 expedition [15:46:33] It looks familiar Peter but just can't remember where and I can't find it in the OER guide [15:46:49] Yes, holothurian [15:46:52] Holothurian for sure, but need to look at references [15:47:16] laetmogonidae? [15:47:34] https://www.ncei.noaa.gov/waf/okeanos-animal-guide/Elasipodida033.html [15:47:54] Bryozoa [15:48:38] Or maybe Oneirophanta Upasana [15:48:52] LAT : 35.888173 , LON : -51.521025 , DEPTH : 2574.2287 m, TEMP : 3.3279 C, SAL : 34.95475 PSU, DO : 8.2105 mg/l [15:50:50] katherinebemis leaves the room [15:51:16] @upasana: hard to tell since they look so similar. Could definitely be a laetmogonid [15:51:39] peterauster leaves the room [15:52:13] Yes!! they look so similar!! [15:52:37] I cannot tell the differences from the images.. [15:52:46] Looks like J clade, e.g. related to Jasonisis [15:53:32] Neither can I [15:53:53] LAT : 35.888204 , LON : -51.521027 , DEPTH : 2570.0384 m, TEMP : 3.33042 C, SAL : 34.95479 PSU, DO : 8.14545 mg/l [15:54:00] katherinebemis leaves the room [15:54:12] FYI, Jasonisis was named for another ROV... yes, as Rhian said. [15:54:28] I chose to believe otherwise :-) [15:54:35] choose [15:54:52] Chrysogorgia, perhaps C. tricaulis [15:54:54] emilycrum leaves the room [15:57:22] A cool thing about tricaulis is that when view from above it would appear to have 3 longitudinal tunnels through the branches. This speaks to the extreme regularity of branch pattern in Chrysogorgia, which is taken advantage of in species description. [15:57:52] agree [15:58:04] pilot watch change [15:58:28] tiny white goniasterid akin to Plinthaster [15:58:53] LAT : 35.888148 , LON : -51.520964 , DEPTH : 2565.4823 m, TEMP : 3.33233 C, SAL : 34.95345 PSU, DO : 8.15528 mg/l [15:59:53] kimberlygalvez leaves the room [16:00:15] kelseyviator leaves the room [16:03:53] LAT : 35.888244 , LON : -51.521017 , DEPTH : 2567.1657 m, TEMP : 3.33659 C, SAL : 34.95566 PSU, DO : 8.16033 mg/l [16:04:50] Is this basalt or carbonate? Looks very angular for carbonate [16:04:53] Almost look like fault scarps its so smooth [16:05:19] carolynruppel leaves the room [16:06:05] FeMn botryoidal fabricate is oriented [16:06:35] dhugallindsay leaves the room [16:06:54] @chris hard to tell if it's basalt or carbonate. Could be the carboant platform that has been transported downslope [16:07:13] Urchin looks like a pedinid [16:07:14] urchin looks like a pedinid [16:07:36] Ok, thanks Kevin [16:08:10] bamboo [16:08:18] christophermah leaves the room [16:08:37] Polyps look like an isidid, but I don't see the nodes [16:08:54] LAT : 35.888243 , LON : -51.520974 , DEPTH : 2564.0308 m, TEMP : 3.33922 C, SAL : 34.95541 PSU, DO : 8.18774 mg/l [16:09:10] weird one scott [16:09:14] Water from Tropical Storm Elsa may be slowing down electrons here ... need to log out and set the lines in the sun to dry out ... enjoy rest of the dive! [16:09:17] That would suggest it is the bramble-ish type we sampled in 2005 on Nashville [16:09:32] I didn't see nodes either on there [16:10:20] I was thinking S1 clade based on the way the polyps were contracting [16:10:33] Tentacle contractions were the strangest [16:10:34] peterauster leaves the room [16:13:12] jocelyncooper leaves the room [16:13:29] Looks like basalt here, [16:13:54] LAT : 35.8882 , LON : -51.52086 , DEPTH : 2561.7128 m, TEMP : 3.34504 C, SAL : 34.95492 PSU, DO : 8.13521 mg/l [16:15:13] @kevin, we are rock hunting [16:16:04] Awesome [16:17:05] looks like a piece of exposed crust on the right [16:18:11] Still working on that ophidiid fish we saw earlier. Looks like it could have been Acanthonus armatus, which has the unfortunate name of assfish that prompted a number of jokes the other day. The bulbous head of that species is pretty unusual [16:18:37] That was the ID that was sent to me at lunch....of course....! [16:18:55] LAT : 35.888305 , LON : -51.520935 , DEPTH : 2564.4776 m, TEMP : 3.34006 C, SAL : 34.95569 PSU, DO : 8.12663 mg/l [16:19:33] Ah got it. I could swear we saw that species in the Pacific but still can't find the photo proving that [16:19:38] @Chris Andrea Balbas says 'Hi' and 'assfish..hahaha' [16:22:14] Hydroid= Corymorphidae [16:23:39] nice shot of inner tentacles which were in a circle rather than horseshoe, the latter typifying Branchiocerianthus, which I think is what Tina told us before [16:23:56] LAT : 35.888343 , LON : -51.52086 , DEPTH : 2563.2647 m, TEMP : 3.34504 C, SAL : 34.95497 PSU, DO : 8.16822 mg/l [16:25:21] Maybe even Corymorpha sp Scott. According to Tina, you differentiate that genus from Branchiocerianthus by whether the zoid cluster around the central tentacles forms a complete ring versus the latter which has a gap in it. Is that how you remember it too, Scott [16:25:49] That one had a complete circle [16:27:00] Center lower is the ideal shape for a rock [16:28:56] LAT : 35.888399 , LON : -51.520838 , DEPTH : 2568.2033 m, TEMP : 3.34039 C, SAL : 34.95544 PSU, DO : 8.18422 mg/l [16:30:09] kelseyviator leaves the room [16:30:26] Darn, good effort [16:32:18] Fatter is better here [16:32:59] pterapod "lag" deposit at rock face [16:33:51] haroldcarlson leaves the room [16:33:57] LAT : 35.888395 , LON : -51.520783 , DEPTH : 2569.0682 m, TEMP : 3.35148 C, SAL : 34.94729 PSU, DO : 8.13262 mg/l [16:34:52] jocelyncooper leaves the room [16:34:55] Still working on that Corymorphidae. My mistake about calling that ring around the central tentacles zooids. Those are instead gonophores. [16:35:04] Great looking rock, fingers crossed [16:35:55] Couple complimentary critters as well [16:37:11] I seemed to have lost the High def feed. Is anyone else having that problem? It say no playable sources found [16:37:48] Cam 1 and 2 are working for me at 1080p [16:38:51] I switched to the public feed so will just go with that. My comments are late anyway [16:38:57] LAT : 35.888361 , LON : -51.52082 , DEPTH : 2566.1715 m, TEMP : 3.3531 C, SAL : 34.95718 PSU, DO : 8.14448 mg/l [16:40:12] @Chris: I have not seen an interruption in the feed. At times like this, I'd restart my browser. [16:40:39] Hmmm. ok I will try that. [16:40:57] christopherkelley leaves the room [16:42:28] leswatling leaves the room [16:43:55] katherinebemis leaves the room [16:43:58] LAT : 35.888483 , LON : -51.520812 , DEPTH : 2566.3519 m, TEMP : 3.34532 C, SAL : 34.9553 PSU, DO : 8.15066 mg/l [16:45:17] carolynruppel leaves the room [16:46:07] Synaphobranchid [16:46:13] rubble mound [16:46:52] sediment ripples [16:48:59] LAT : 35.88848 , LON : -51.520644 , DEPTH : 2563.4336 m, TEMP : 3.34818 C, SAL : 34.9551 PSU, DO : 8.15056 mg/l [16:49:15] katherinebemis leaves the room [16:54:00] LAT : 35.888507 , LON : -51.520551 , DEPTH : 2558.5601 m, TEMP : 3.34532 C, SAL : 34.95578 PSU, DO : 8.15279 mg/l [16:55:16] katherinebemis leaves the room [16:56:47] @ jasonchaytor... big basic difference between wind at mountains and water at mountains is that air compressed and decompresses. [16:57:41] @bob, right, certainly no compression of the seawater [16:59:00] LAT : 35.888543 , LON : -51.520498 , DEPTH : 2548.1054 m, TEMP : 3.35798 C, SAL : 34.95652 PSU, DO : 8.15342 mg/l [16:59:05] Still surprised about the lack of filer feeders here. Maybe the water current is moving in the wrong direction [16:59:42] me too Kevin [17:00:58] kelseyviator leaves the room [17:01:38] Enyptiates [17:04:01] LAT : 35.888593 , LON : -51.520371 , DEPTH : 2539.8136 m, TEMP : 3.38171 C, SAL : 34.95725 PSU, DO : 8.17038 mg/l [17:04:05] a note about the lack of filter feeders. We found a significant decrease in corals and sponges below 2500 m so it may simply be a depth issue here and as you go upslope shallower than that depth, you may see more [17:04:38] This was in the Pacific though with different O2 levels [17:05:04] Pterasterid.. from the family of slime stars [17:05:45] to what extent do FeMn encrusted corals show up in the fossil record? [17:06:50] katherinebemis leaves the room [17:07:30] I'm not sure what the oldest is, but Desmophyllum dianthus I know has been dated to at least 200K @harold [17:08:16] carolynruppel leaves the room [17:08:54] What is depth at the top of this seamount? [17:09:00] @harold, depends on the sampling location, but less than you would think. I am taking a quick look for literature now [17:09:03] LAT : 35.888623 , LON : -51.520434 , DEPTH : 2532.3952 m, TEMP : 3.4329 C, SAL : 34.95705 PSU, DO : 8.18949 mg/l [17:09:14] 2300m @jocelyn [17:09:35] that is one old cup coral! @rhian [17:10:13] kimberlygalvez leaves the room [17:10:47] Wow [17:11:06] @Harold Not sure if I've ever seen one collected from uplifted marine sediments in the terrestrial realm. Good question [17:11:17] By why did it die out? [17:11:55] demosponges and glass sponges [17:12:07] I have caught one or two in sediment cores, but they didn't have the FeMn coating [17:12:27] Pure speculation but I wonder if glacial - interglacial changes in N. Atlantic water current directions effects which side of the seamount has colonies [17:13:31] Interesting idea Kevin [17:13:47] yes cuc [17:13:58] There are hypotheses on changes to NADW at that time [17:14:03] LAT : 35.888669 , LON : -51.52044 , DEPTH : 2529.0105 m, TEMP : 3.44039 C, SAL : 34.95789 PSU, DO : 8.13996 mg/l [17:14:14] Its a synallactid I think but not sure which genus [17:14:18] Holo mouth on right. Gel body few visible features [17:14:59] Could be in the genus Paleopatides [17:15:16] carolynruppel leaves the room [17:15:25] katherinebemis leaves the room [17:15:27] sorry mispelled Paelopatides [17:15:32] is FeMn accumulation rate relatively constant throughout geologic time? Are there periods where it just didn't form? [17:16:20] J clade, as seen earlier [17:17:10] @Harold, rate is effected by oxygen levels as well as current flow rates. It is also believed to be mediated by microorganisms. So rate could definitely change often over millions of years [17:17:44] Sediment also inhibits it [17:17:46] This one is different because of the curvy branches. I suspect it is S1 clade, unrelated to previous brambles [17:17:49] @harold, it does change, especially if oceanographic conditions restrict or enhance transport of the minerals from source locations or the redox condition change from favorable to unfavorable for precipitation [17:19:03] LAT : 35.8887 , LON : -51.520477 , DEPTH : 2523.1621 m, TEMP : 3.44358 C, SAL : 34.96043 PSU, DO : 8.18749 mg/l [17:20:22] eel could be in the genus Ilyophis. Thought I saw white lateral line pores as well as the dorsal fin origin is close to the head [17:20:24] I'd guess J clade again... [17:20:49] Note opaque tissues give a millky color... [17:20:51] Agree [17:21:01] Cup coral thanatocenosis! [17:21:29] ...likely due to lots of small scale-like sclerites in tissue. [17:22:58] black coral [17:23:34] Can't tell in dark. Is that a Stauropathes? [17:23:51] What is the cup coral made of? We could try to date a few with U-Th disequilbria methods to see when they died off [17:24:04] LAT : 35.888738 , LON : -51.520421 , DEPTH : 2518.2904 m, TEMP : 3.44676 C, SAL : 34.95858 PSU, DO : 8.16197 mg/l [17:24:20] aragonite - there are a lot of studies that have dated them from various locations using U/Th [17:24:30] Johndeitz leaves the room [17:26:04] Yup, Stauropathes. I think the bamboo croal was different than previous, perhaps an "Isidella" type (I clade) [17:26:15] @Kevin, in this area as well as in the SW Pacific, dating studies show that the populations of this species increase during the glacial periods and decrease in the interglacials [17:26:47] The Isidella was the colony next to the Stauro [17:26:51] Neat [17:26:58] @Scott, didn't we see this straight branched bamboo on dive 2 or 3? [17:27:16] @Les: yes. We may even have collected it. [17:28:15] Reading up a little, at around the LGM, nutirent rich Antarctic water was dominant below 2 km in the atlantic, later replaced by the low nutrient arctic water, so perhaps the an abrupt shift such as that lead to the Desmo die off?? [17:28:44] katherinebemis leaves the room [17:28:51] haroldcarlson leaves the room [17:29:04] LAT : 35.88864 , LON : -51.520548 , DEPTH : 2512.4196 m, TEMP : 3.44799 C, SAL : 34.95969 PSU, DO : 8.15061 mg/l [17:29:05] christophermah leaves the room [17:29:07] Hmm, does it have a stalk? [17:29:37] @jason Cool, sounds like a testable hypothesis [17:29:47] Where are we on the planned transect with respect to the steep wall? In my experience the suspension feeders tend to prefer the upper half of such walls. [17:29:59] Its a euplectellid, either Rhabdopectella or Hertwigia depending on whether it has a stalk I suppose [17:30:05] about 1/2 way up the wall feature [17:30:12] @scott we are currently on the steepest section [17:31:09] maps are showing 56 degree slope [17:31:22] Then that supports previous observations that the lower wall is not as attractive a place to make a living. [17:31:49] It could also be an undescribed corbitellinae, if it is a vase shaped sponge. [17:34:04] LAT : 35.888678 , LON : -51.520519 , DEPTH : 2501.1035 m, TEMP : 3.47376 C, SAL : 34.94171 PSU, DO : 8.11858 mg/l [17:34:06] demosponges and a rossellid with has the large osculum and fuzzy body [17:37:38] christophermah leaves the room [17:38:10] these almost looked like pillows [17:39:04] LAT : 35.888657 , LON : -51.520533 , DEPTH : 2489.9005 m, TEMP : 3.46052 C, SAL : 34.95909 PSU, DO : 8.11967 mg/l [17:40:11] @Jason, do you know the rate of subsidence of these volcanos from this area? [17:40:40] This is the I-clade bamboo coral I noted earlier [17:40:54] This sponge could be Atlantisella sp [17:41:09] At least, that is my first impression [17:42:18] @les, 40 - 60 m per million years has been proposed for the New ENgland seamounts [17:42:34] not sure if it si the same here [17:43:22] Looks like a pretty big one [17:43:46] that bamboo sure reminds me of Isidella trichotoma of Bayer from the Pacific... [17:44:05] LAT : 35.888757 , LON : -51.520561 , DEPTH : 2487.6384 m, TEMP : 3.44643 C, SAL : 34.96002 PSU, DO : 8.14583 mg/l [17:44:17] @les, with the possible limestone sample we collected, we might be able to develop a rate for this area [17:44:22] @Jason thanks, that was a number I was always looking for. [17:44:41] great video on dumbo. Thanks Roland [17:45:20] carolynruppel leaves the room [17:46:25] looking for a chrysogorgia to put its egg case in... [17:46:47] You think this is an adult or could it be a juvenile? [17:47:08] carolynruppel leaves the room [17:47:26] @Chris: don't know, but it is very transparent... [17:47:42] katherinebemis leaves the room [17:48:33] do they always hold the tentacles like that? [17:49:06] LAT : 35.888741 , LON : -51.520511 , DEPTH : 2481.835 m, TEMP : 3.44816 C, SAL : 34.95983 PSU, DO : 8.15442 mg/l [17:49:37] did anyone catch the name? [17:50:19] Not me [17:50:40] can he state the name again [17:51:10] Stauroteuthis [17:51:13] Stauroteuthis syrtensis [17:52:21] white seastar [17:53:03] another pterasterid, right Chris M? [17:54:06] LAT : 35.888654 , LON : -51.520409 , DEPTH : 2482.7265 m, TEMP : 3.44458 C, SAL : 34.96135 PSU, DO : 8.10074 mg/l [17:55:44] a confusing array of bamboos [17:55:46] impressive overhang [17:56:12] katherinebemis leaves the room [17:57:04] christophermah leaves the room [17:58:27] Below the anemone to lower left was also a euplectellid vase sponge in the subfamily corbitellinae [17:59:03] So I think that is what you got a closeup of earlier looking right down the mouth [17:59:06] yes.. Chris K! [17:59:08] LAT : 35.888579 , LON : -51.520387 , DEPTH : 2479.977 m, TEMP : 3.46281 C, SAL : 34.96014 PSU, DO : 8.14163 mg/l [18:00:01] geology gets its revenge on all those creatures defacing the rocks [18:00:49] can cup corals possibly bud to get so dense? Or do we infer aggragative behavior of recruits? Direct and extremely limited dispersal? How does such a dense layer of cup corals develop? [18:02:47] Given the fossils may be 200,000 years old, I think at least part of the answer is that we are seing the result of many generations. [18:04:08] LAT : 35.888622 , LON : -51.52037 , DEPTH : 2475.6492 m, TEMP : 3.45912 C, SAL : 34.96213 PSU, DO : 8.1802 mg/l [18:06:04] should cut off that bamboo piece that is hanging over part of the ROV and take it too. [18:06:27] christophermah leaves the room [18:07:32] that was a thick bunch of dead Desmos [18:09:00] Nice spikey collectible sponge at right [18:09:08] LAT : 35.888607 , LON : -51.520418 , DEPTH : 2475.2769 m, TEMP : 3.46152 C, SAL : 34.96047 PSU, DO : 8.12497 mg/l [18:12:40] Thanks Rhian don't know if it is demosponge or glass sponge so it will be very useful collection [18:13:03] Roger that - they're trying [18:13:58] jocelyncooper leaves the room [18:14:08] LAT : 35.888692 , LON : -51.520379 , DEPTH : 2475.0621 m, TEMP : 3.47929 C, SAL : 34.95264 PSU, DO : 8.17508 mg/l [18:14:46] is it a sponge or urchin. Can't even tell but useful regardless. Many thanks [18:15:18] Pretty sure it's a sponge - will let you know when it comes up! [18:15:30] I think it is a sponge though so agree Rhian [18:16:14] Is that a worm [18:16:45] Sorry Chris, missed it [18:17:29] no problem but something was seriously wiggling in the water column and was fairly long [18:19:09] LAT : 35.888621 , LON : -51.520359 , DEPTH : 2468.2336 m, TEMP : 3.45688 C, SAL : 34.96085 PSU, DO : 8.10233 mg/l [18:21:06] @Les: did you see earlier the thin-boned branching isidids with distal branches curling. Look to me like S1. Don't think we know those from out here yet (that is, I don't believe any have been collected in the western Atlantic away from the continental slope. [18:21:13] christophermah leaves the room [18:21:50] @Scott, yeah, that is why I thought that one by the ROV during the Desmo and sponge collection should be taken [18:22:23] Only the S1 clade can do that curly branch thing among the bamboos... nodes are weak and not calcified as in other keratos [18:23:29] dead Iridogorgia skeleton [18:24:09] LAT : 35.888642 , LON : -51.520307 , DEPTH : 2457.2158 m, TEMP : 3.46275 C, SAL : 34.9601 PSU, DO : 8.12835 mg/l [18:24:53] a living I magnispiralis [18:25:14] Just a note about the sponge collection. ˇhe OER guide has a similar looking sponge identified as only hexactinellida? so that was a very important collection. We may finally figure out what those things are. [18:26:33] this is a little deep for the I magnispiralis, maybe by a couple of hundred meters or so, and may explain why they don't look so great [18:27:41] Hope we get to see the upper edge of this steep feature. Given what we see here, the lip-edge may be a great spot. [18:27:44] Maybe pillow basalt and/or lobate flow textures. Hard to tell here [18:28:00] a big oldie...very ncie [18:28:22] interpreting the geology has become challenging [18:28:24] Evoplosma [18:28:30] sorry Evoplosoma [18:28:34] seastar is helping me see the branching nodes! [18:28:37] Its so stuffed from stripping those branches, its just laying there [18:28:55] Isidella / I clade [18:29:10] LAT : 35.888573 , LON : -51.520257 , DEPTH : 2449.881 m, TEMP : 3.46717 C, SAL : 34.96001 PSU, DO : 8.14303 mg/l [18:29:13] Always by themselves.. seldom more than one [18:29:31] that's the one it seems to like to eat... I think we first saw that at Bear seamount, will need to check [18:29:43] it does have a more pillow/lobate morphology as we start to get to the slightly shallower slope angles [18:29:45] @Rhian: I think you mean Bathypathes, not Bathygorgia. [18:30:15] Short node interval [18:30:35] I mean internode interval [18:30:44] jocelyncooper leaves the room [18:30:46] I think there may have been regrowth there [18:31:02] from the 2 nodes close together Scott? [18:31:24] @Chris: yes, and the thicker tissue just below that [18:31:47] watch change [18:31:50] Interesting: I saw in any spot what seemed like irregular spacing to the nodes [18:32:21] *noy "any" - "other". I really am not in full form today. [18:32:30] not sure what to make of that one. golden nodes suggest S1 as noted earlier, not too heavily reinforced. [18:33:44] emilycrum leaves the room [18:33:54] sorry, have to go... arrrgh.... see y'all tomorrow [18:34:03] bye les [18:34:10] LAT : 35.888642 , LON : -51.520285 , DEPTH : 2450.2382 m, TEMP : 3.46331 C, SAL : 34.96138 PSU, DO : 8.16815 mg/l [18:35:00] leswatling leaves the room [18:35:26] thomasmorrow leaves the room [18:37:47] kimberlygalvez leaves the room [18:39:10] LAT : 35.888707 , LON : -51.52028 , DEPTH : 2444.9827 m, TEMP : 3.4651 C, SAL : 34.95731 PSU, DO : 8.14788 mg/l [18:40:18] I'm surprised we're almost at the top and still aren't seeing clear carbonate features. Makes that carbonate structure towards the start of the dive more interesting [18:40:21] Rossellid vase [18:41:04] christophermah leaves the room [18:43:27] @kevin, rightm it has to be here somewhere, just not where the here is [18:44:11] LAT : 35.888748 , LON : -51.520272 , DEPTH : 2437.1273 m, TEMP : 3.46907 C, SAL : 34.96347 PSU, DO : 8.16083 mg/l [18:45:23] @kevin I think I read awhile back that some guyots don't have carbonate caps. I think it was in one of the papers in Pringle et al 1993. But that doesn't explain the carbonate down deeper. Pretty strange [18:46:33] Conviently, Chaytor et al., 2007 had a great paper on guyots forming from lava caldera infilling in the Cobb-Bowie range if I remember correctly [18:47:05] chaytor is a clown, don't trust anything he writes [18:47:08] Alternately, could rejuvenated flows have covered up carbonate on the top? [18:47:35] haroldcarlson leaves the room [18:47:41] typically rejuvenated features manifest as small cones and aren't high enough volume to fill in whole top. But you never know [18:47:43] Yeah but chaytor got a coral named after his first name though [18:47:53] And a submarine! [18:48:14] And a horror movie staple! [18:48:30] it was going so well there for a minute [18:49:12] LAT : 35.888783 , LON : -51.520271 , DEPTH : 2434.3447 m, TEMP : 3.47868 C, SAL : 34.96751 PSU, DO : 8.13332 mg/l [18:52:12] If we aren't at the top, then this is much more stair-stepping than it seemed from the slope map. Guess it is all about scale. [18:53:27] @scott, becasue we have been traversing diagonally across the grid cells, 40-45 m of bottom is a single data cell, so there is some sponginess in the slope [18:54:12] LAT : 35.888884 , LON : -51.520334 , DEPTH : 2427.715 m, TEMP : 3.48371 C, SAL : 34.96107 PSU, DO : 8.16733 mg/l [18:54:57] kiramizell leaves the room [18:55:22] christophermah leaves the room [18:55:52] I think you are all now hallucinating! [18:55:59] That looks more carbonate like. Flat plates [18:56:00] jocelyncooper leaves the room [18:57:58] OK, you convinced me [18:58:44] Could be a burrowing sea cucmber [18:59:07] They would orient like that with oral arms exteded [18:59:12] LAT : 35.88886 , LON : -51.520291 , DEPTH : 2427.0097 m, TEMP : 3.49086 C, SAL : 34.96194 PSU, DO : 8.11115 mg/l [19:00:15] There is a group of burrowing anemones (Edwardsiidae), but I don't think they have pinnulate tentacles [19:00:52] I didn't think any anemones had pinnules either.....and honestly the oral area just looked wrong fora cnidarian.... [19:01:59] @Rhian: I know of at least a couple of anemones (from shallow water) that have dendritic tentacles, but I agree not pinnulated [19:02:05] Back to ambigious geology [19:02:13] cindyvandover leaves the room [19:02:22] wouldn't be any fun if it was easy [19:03:06] Thank you everyone! [19:03:10] Great dive, piloting and commentary [19:03:30] see ya tomorrow [19:03:35] kevinkonrad leaves the room [19:04:04] christophermah leaves the room [19:04:05] upasanaganguly leaves the room [19:04:13] LAT : 35.888929 , LON : -51.5203 , DEPTH : 2421.7131 m, TEMP : 3.49527 C, SAL : 34.96789 PSU, DO : 8.16149 mg/l [19:04:58] rhianwaller leaves the room [19:05:00] christopherkelley leaves the room [19:05:07] scottfrance leaves the room [19:05:47] gordonrees leaves the room [19:08:36] jaymesawbrey leaves the room [19:08:54] EX2104_DIVE07 ROV Ascending [19:09:13] LAT : 35.889008 , LON : -51.520506 , DEPTH : 2403.8704 m, TEMP : 3.51488 C, SAL : 34.96215 PSU, DO : 8.15211 mg/l [19:09:57] jocelyncooper leaves the room [19:11:50] great dive! [19:12:24] haroldcarlson leaves the room [19:14:13] LAT : 35.88889 , LON : -51.520732 , DEPTH : 2259.8694 m, TEMP : 3.7101 C, SAL : 34.97344 PSU, DO : 8.12085 mg/l [19:19:14] LAT : 35.88871 , LON : -51.52088 , DEPTH : 2109.6916 m, TEMP : 3.85919 C, SAL : 34.98314 PSU, DO : 8.14862 mg/l [19:19:55] georgematsumoto leaves the room [19:23:40] jasonchaytor leaves the room [19:24:15] LAT : 35.888799 , LON : -51.520761 , DEPTH : 1963.4577 m, TEMP : 3.99868 C, SAL : 34.98975 PSU, DO : 8.16842 mg/l [19:29:15] LAT : 35.888739 , LON : -51.52064 , DEPTH : 1816.5216 m, TEMP : 4.1257 C, SAL : 34.99447 PSU, DO : 8.18789 mg/l [19:34:16] LAT : 35.888226 , LON : -51.520399 , DEPTH : 1672.124 m, TEMP : 4.45182 C, SAL : 35.02467 PSU, DO : 7.99389 mg/l [19:39:16] LAT : 35.887686 , LON : -51.520248 , DEPTH : 1518.2412 m, TEMP : 4.77956 C, SAL : 35.05056 PSU, DO : 7.95843 mg/l [19:44:17] LAT : 35.886943 , LON : -51.520012 , DEPTH : 1365.0197 m, TEMP : 5.38441 C, SAL : 35.1098 PSU, DO : 7.52246 mg/l [19:49:18] LAT : 35.88618 , LON : -51.519891 , DEPTH : 1211.8494 m, TEMP : 6.27302 C, SAL : 35.18221 PSU, DO : 6.91798 mg/l [19:54:18] LAT : 35.885395 , LON : -51.519768 , DEPTH : 1057.9743 m, TEMP : 6.99688 C, SAL : 35.13661 PSU, DO : 6.20047 mg/l [19:59:18] LAT : 35.884576 , LON : -51.519687 , DEPTH : 908.9245 m, TEMP : 9.21751 C, SAL : 35.24543 PSU, DO : 5.14881 mg/l [20:04:19] LAT : 35.883694 , LON : -51.51954 , DEPTH : 761.0911 m, TEMP : 12.43499 C, SAL : 35.5954 PSU, DO : 5.16242 mg/l [20:09:20] LAT : 35.882787 , LON : -51.519452 , DEPTH : 613.0559 m, TEMP : 15.67862 C, SAL : 36.09071 PSU, DO : 6.2565 mg/l [20:14:20] LAT : 35.881875 , LON : -51.519336 , DEPTH : 464.3115 m, TEMP : 17.81851 C, SAL : 36.4645 PSU, DO : 6.59198 mg/l [20:19:20] LAT : 35.881039 , LON : -51.519187 , DEPTH : 318.5153 m, TEMP : 18.4876 C, SAL : 36.59242 PSU, DO : 6.9905 mg/l [20:24:21] LAT : 35.880069 , LON : -51.518887 , DEPTH : 171.5768 m, TEMP : 18.85572 C, SAL : 36.63411 PSU, DO : 7.02111 mg/l [20:29:22] LAT : 35.878952 , LON : -51.518753 , DEPTH : 56.1634 m, TEMP : 20.76932 C, SAL : 36.69948 PSU, DO : 6.81487 mg/l [20:33:50] EX2104_DIVE07 ROV on Surface [20:34:22] LAT : 35.877775 , LON : -51.518609 , DEPTH : 1.7583 m, TEMP : 26.26658 C, SAL : 36.56429 PSU, DO : 6.92737 mg/l [20:49:41] EX2104_DIVE07 ROV Recovery Complete [20:51:11] iscwatch leaves the room