The QCC Posted June 1, 2017 Share Posted June 1, 2017 Is this an Echinoid? I found this on the end of a piece of pyritized coral I received from Bob O'Donnell. It looks like the teacher gave the coral a gold star for brilliance. It is approximately 1mm across it's points. Microscope: Zeiss Stemi 305edu, 2x photo eyepiece. Camera: Canon 1000d: 1x objective (2x mag.) 2x objective (4x mag.) 6x objective (12x mag.) Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 1, 2017 Share Posted June 1, 2017 It's a nice looking crinoid columnal. Any idea of the age? 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...
ynot Posted June 1, 2017 Share Posted June 1, 2017 Agree with crinoid colum segment. The surface incrustation appears to be iron pyrite. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
jewelonly Posted June 1, 2017 Share Posted June 1, 2017 Sorry I'm no help, but it is an exquisite little thing with a lovely setting. I love the color contrast. Link to comment Share on other sites More sharing options...
The QCC Posted June 1, 2017 Author Share Posted June 1, 2017 I apologize for my lack of knowledge about the stem. I received it from Bob O'Donnel who is the curator of the Arkona Lions Museum. He was showing me so many small fossils I was overwhelmed with names. I recall he said it was pyritized and would look good under a microscope. The stem is approximately 27mm long and I did not see the star on the end until I rotated the stem under the microscope. I picked up several chunks of matrix from the Hungry Hollow Arkona formation, but do not believe the crinoid is from there. Link to comment Share on other sites More sharing options...
Rockwood Posted June 1, 2017 Share Posted June 1, 2017 At this scale wouldn't the mathematical odds greatly favor it being a pinnule ? Or does the shape preclude that alternative ? 1 Link to comment Share on other sites More sharing options...
Miocene_Mason Posted June 1, 2017 Share Posted June 1, 2017 Looks like a crinoid stem section “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
Rockwood Posted June 1, 2017 Share Posted June 1, 2017 2 hours ago, The QCC said: It is approximately 1mm across it's points. Ahem 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 1, 2017 Share Posted June 1, 2017 Good call, Dale. 2 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...
Rockwood Posted June 1, 2017 Share Posted June 1, 2017 1 hour ago, ynot said: Agree with crinoid colum segment. The surface incrustation appears to be iron pyrite. 18 minutes ago, WhodamanHD said: Looks like a crinoid stem section If these refer to the larger piece I almost missed the fact that that might not be clear. Link to comment Share on other sites More sharing options...
Rockwood Posted June 1, 2017 Share Posted June 1, 2017 Pinnules can be numerous. 2 Link to comment Share on other sites More sharing options...
abyssunder Posted June 1, 2017 Share Posted June 1, 2017 The star shaped fossil is a nice crinoid columnal (pinnules are not pentagonal in cross section, as far as I know). On the opposite side (picture #2 of O.P.) are encrusting epibionts, which look similar to Ascodictyon sp. Here is an example of Ascodictyon vinelliforme (Kiepura, 1965) on Pentagonostipes petaloides (Moore and Jeffords, 1968), GIUS−4−2445/21, Figure F: Also, here is an example of Pentagonostipes columnal articular facet (D & E, Fig. 3), which looks similar to the specimen in question: Reference: Głuchowski, E. 2005. Epibionts on upper Eifelian crinoid columnals from the Holy Cross Mountains, Poland. Acta Palaeontologica Polonica 50 (2): 315–328 Scheffler, S. M. et al. 2010. Crinóides da borda leste da bacia do Parnaíba (Formação Cabeças, Devoniano Médio). Bol. Mus. Para. Emílio Goeldi. Cienc. Nat., Belém, v. 5, n. 2, p. 165-173 2 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Rockwood Posted June 1, 2017 Share Posted June 1, 2017 We might want to point out that there is a taxonomic distinction between echinoids and echinoderms too. Link to comment Share on other sites More sharing options...
abyssunder Posted June 2, 2017 Share Posted June 2, 2017 That is correct. Echinoids and crinoids are echinoderms. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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