West4me Posted June 24, 2010 Share Posted June 24, 2010 Went out today and did some scrambling around in a new location. Mississippian Burlington Limestone I think they are crinoid aboral cups. If so they are the first I have found. "You have to listen. It is under the rocks." Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 24, 2010 Share Posted June 24, 2010 West4me, Cool find! Unfortunately, I know little about Criinoids. Congratulations on this if it is your first Crinoid cup! Whatever it is, I like it! Regards, Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
West4me Posted June 24, 2010 Author Share Posted June 24, 2010 West4me, Cool find! Unfortunately, I know little about Criinoids. Congratulations on this if it is your first Crinoid cup! Whatever it is, I like it! Regards, I don't know anything either, I am just going off of this sketch: "You have to listen. It is under the rocks." Link to comment Share on other sites More sharing options...
TheInsomniac Posted June 24, 2010 Share Posted June 24, 2010 Went out today and did some scrambling around in a new location. Mississippian Burlington Limestone I think they are crinoid aboral cups. If so they are the first I have found. I believe it could be a holdfast, the attachment point for the stalk. I'm not an expert on Burlington crinoids, but irregularity of the plating and flat, discoid shape doesn't look like a cup to me. Here's a holdfast from the Ordovician for comparison: http://drydredgers.org/crinoid4.htm Link to comment Share on other sites More sharing options...
West4me Posted June 24, 2010 Author Share Posted June 24, 2010 I believe it could be a holdfast, the attachment point for the stalk. I'm not an expert on Burlington crinoids, but irregularity of the plating and flat, discoid shape doesn't look like a cup to me. Here's a holdfast from the Ordovician for comparison: http://drydredgers.org/crinoid4.htm Thanks for the resource, that seems like a more likely candidate. "You have to listen. It is under the rocks." Link to comment Share on other sites More sharing options...
Archimedes Posted June 25, 2010 Share Posted June 25, 2010 I believe it is a EUTROCHOCRINUS fairly common in the Burlinton ls. Link to comment Share on other sites More sharing options...
TheInsomniac Posted June 25, 2010 Share Posted June 25, 2010 I believe it is a EUTROCHOCRINUS fairly common in the Burlinton ls. That's a possibility: http://www.geology.ohio-state.edu/~ausich/EutrochocrinusChrysti.jpg It seems very flat for a Eutrochocrinus cup. But it could be the tegmen, the top part of the cup. Which would make this an oral view, and make the circular impression the attachment point for the anal tube rather than the stalk. Link to comment Share on other sites More sharing options...
Mr. Edonihce Posted June 29, 2010 Share Posted June 29, 2010 I believe it could be a holdfast, the attachment point for the stalk. I'm not an expert on Burlington crinoids, but irregularity of the plating and flat, discoid shape doesn't look like a cup to me. Here's a holdfast from the Ordovician for comparison: http://drydredgers.org/crinoid4.htm I believe it is a EUTROCHOCRINUS fairly common in the Burlinton ls. Holdfast was a worthy guess, but I think Archimedes is right-on here. Both 'Fossil Crinoids' (Hess) and the 'Treatise on Invertebrate Paleontology' (Moore, Teichert) have specimens that look very similar. Especially when they are fro the Mississippian Burlington Limestone, it seems hard to look anywhere else. That's a possibility: http://www.geology.ohio-state.edu/~ausich/EutrochocrinusChrysti.jpg It seems very flat for a Eutrochocrinus cup. But it could be the tegmen, the top part of the cup. Which would make this an oral view, and make the circular impression the attachment point for the anal tube rather than the stalk. I considered the tegman possibility, and one of the images in 'the Treatise' even has one with a tegman that is broken right where this specimen appears to be broken. However, when I look at the individual plates that make up this item, they seem more like what are on the aboral side of the specimens in the literature. So, it could be either. I'd like to see some closer, higher resolution photos if at all possible. . ____________________ scale in avatar is millimeters ____________________ Come visit Sandi, the 'Fossil Journey Cruiser' ____________________ WIPS (the Western Interior Paleontological Society - http://www.westernpaleo.org) ____________________ "Being genetically cursed with an almost inhuman sense of curiosity and wonder, I'm hard-wired to investigate even the most unlikely, uninteresting (to others anyway) and irrelevant details; often asking hypothetical questions from many angles in an attempt to understand something more thoroughly." -- Mr. Edonihce Link to comment Share on other sites More sharing options...
West4me Posted June 29, 2010 Author Share Posted June 29, 2010 (edited) Here are closer pictures of the two specimens. The thumbnail is black on my computer but clicking on it makes takes you to the image. Edited June 29, 2010 by West4me "You have to listen. It is under the rocks." Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now