Guest solius symbiosus Posted March 20, 2009 Share Posted March 20, 2009 Anyone have any experience with cyclocystoids? I found this today(early Late Ordovician???), and I am hesitant to "call" it a one because of their extreme rarity. It could be a weathered holdfast, but I don't think so. At first I thought that it was an ossicle that had weathered, but upon closer inspection, it clearly is not. I was able to view a slab with 9 cyclocystoids last year that was found in the same member, but about 25 miles from this locality, and some of those were also, somewhat, disarticulated. Too, I pulled 7 crinoids from the outcrop today; 2 of which are nearly complete. Thoughts??? Link to comment Share on other sites More sharing options...
Northern Sharks Posted March 20, 2009 Share Posted March 20, 2009 I can only compare it to the one I found here last summer. I don't know how many species there are, but mine, and others I've seen photos of all seem to have a lot more plates around the rim than I see on yours, unless of course it is weathered and they just didn't show up in the photo. There's no limit to what you can accomplish when you're supposed to be doing something else Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted March 20, 2009 Share Posted March 20, 2009 It is hard to discern in the photo, but I counted 36 under the microscope. It is weathered, but I'll see if I can get a better image. Here is the abstract of a presentation given last year on the only other ones, that I am aware of, to be found around here. This is the slab that I saw last year. http://gsa.confex.com/gsa/2007SE/finalprog...ract_118775.htm Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted March 20, 2009 Share Posted March 20, 2009 This is at magx20. Link to comment Share on other sites More sharing options...
Auspex Posted March 20, 2009 Share Posted March 20, 2009 This is at magx20. Yes, the segments are evident around the inner edge. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
crinus Posted March 20, 2009 Share Posted March 20, 2009 This is at magx20. Difficult to tell from the picture. You have to be careful as dead crinoids then to curl into a circle. Your image is a bit out of focus, but I think I see a biserial pattern, suggesting maybe a crinoid arm that has curled. crinus Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted March 20, 2009 Share Posted March 20, 2009 I've pulled 50-60 crinoids from this outcrop, and if it is an arm, it is atypical. Though, I have found a few holdfasts that are similar, but they all show multiple rings. I'll post some photos of those later. Link to comment Share on other sites More sharing options...
crinoid1 Posted June 8, 2009 Share Posted June 8, 2009 It appears to be a segment of a large crinoid stem, as if you were looking straight down onto it, but thats just my opinion I like crinoids...... Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted June 8, 2009 Share Posted June 8, 2009 It might be a cirri from a stem, but I don't think that it is an ossicle. I have found holdfasts at this out crop that are similar. Link to comment Share on other sites More sharing options...
Jevans Posted June 9, 2009 Share Posted June 9, 2009 It might be a cirri from a stem, but I don't think that it is an ossicle. I have found holdfasts at this out crop that are similar. Two weeks ago I found something like this in Lake Michigan and I am not sure what it is ? Jevans Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted June 9, 2009 Share Posted June 9, 2009 Two weeks ago I found something like this in Lake Michigan and I am not sure what it is ? Post a pic and it can probably be IDed. The one above was found in Mid Ord rocks. In those rocks I have found numerous Reteocrinus sp., and the pinnules from one other genus not identified. I think that the holdfast is associated with the un-identified genus. Here is another holdfast from rocks of similar age, but different outcrop. At this outcrop, I have found numerous Pychnocrinus sp. and a few of what are probably Archaeocrinus sp. Width of pic about 6cm Link to comment Share on other sites More sharing options...
crabfossilsteve Posted June 9, 2009 Share Posted June 9, 2009 Post a pic and it can probably be IDed. The one above was found in Mid Ord rocks. In those rocks I have found numerous Reteocrinus sp., and the pinnules from one other genus not identified. I think that the holdfast is associated with the un-identified genus.Here is another holdfast from rocks of similar age, but different outcrop. At this outcrop, I have found numerous Pychnocrinus sp. and a few of what are probably Archaeocrinus sp. Width of pic about 6cm Hey Solius I am no expert on those cyclocystoides,but I tend to agree with Crinus that the plate structure in your mag doesn't quite look right. However, I think they were believed to have about 40 submarginal plates. They are cool buggers though. I collected one years ago in the Ordovician Verulum Formation up in Ontario. Crabfossilstevel Link to comment Share on other sites More sharing options...
Jevans Posted June 9, 2009 Share Posted June 9, 2009 Post a pic and it can probably be IDed. The one above was found in Mid Ord rocks. In those rocks I have found numerous Reteocrinus sp., and the pinnules from one other genus not identified. I think that the holdfast is associated with the un-identified genus.Here is another holdfast from rocks of similar age, but different outcrop. At this outcrop, I have found numerous Pychnocrinus sp. and a few of what are probably Archaeocrinus sp. Width of pic about 6cm I am not really sure how to post pictures yet, once my son shows me I will get a picture. The only thing I can say it is tightly coiled together and have not seen anything like it yet except that one picture of yours. Thanks Jevans Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted June 10, 2009 Share Posted June 10, 2009 Hey SoliusI am no expert on those cyclocystoides,but I tend to agree with Crinus that the plate structure in your mag doesn't quite look right. However, I think they were believed to have about 40 submarginal plates. They are cool buggers though. I collected one years ago in the Ordovician Verulum Formation up in Ontario. Crabfossilstevel I have found a couple more of these since making the original post, and they are less dis-articulated and attached to a hardground(or other sessile organism). For those reasons, I'm thinking that it is the basal attachment for a stem. It is unlike any other arm that I have seen from this outcrop, and does not resemble any other ossicle found there. And, I have seen thousands from this bed. Here is the "typical" crinoid found there: And the punnulate arm of an atypical: Link to comment Share on other sites More sharing options...
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