Bullsnake Posted December 26, 2011 Share Posted December 26, 2011 Upper Pennsylvanian, Missourian stage, I believe Lansing group. Haven't pinned down the strata. These were found on the ledge between the arrows. The ledge is maybe a 10-15 foot wide 'deck', in front of the uppermost outcrop shown in the picture. Below this, on the slope I found what I think is Myalina, and Aviculopecten, which is indicative of Rock Lake Shale member, but I really don't know what it is. I'm assuming they are crinoid parts, but can't find any pictures that look like these. Also found in the area Various brachs Horn coral Bryozoan Crinoid stems and plates (stem on the left is bryozoan encrusted) Another shot of the roadcut Steve Link to comment Share on other sites More sharing options...
BobWill Posted December 26, 2011 Share Posted December 26, 2011 Of the three in the first picture the bottom right certainly looks like a cup bottom with the stem attachment area but it's oddly broken, not in the usual symetrical five parts. The top one could be a swollen stem with sponge borings if the ends have those stem marks, but the bottom left is a mystery to me too. Link to comment Share on other sites More sharing options...
Indy Posted December 27, 2011 Share Posted December 27, 2011 (edited) This one reminds me of the coral Michelinia Google Image search: Michelinia Another post on our forum: Pennsylvanian Tabulata Michelinia Link Difficult to know for sure from the images...You have the fossils in hand if this one is a crinoid stem, then it appears to Parasitic Borings. Website Link Edited December 27, 2011 by Indy Flash from the Past (Show Us Your Fossils)MAPS Fossil Show Link to comment Share on other sites More sharing options...
Missourian Posted December 27, 2011 Share Posted December 27, 2011 (edited) Nice pieces. Could this be a crinoid calyx with bore holes as well?: Edited December 27, 2011 by Missourian Context is critical. Link to comment Share on other sites More sharing options...
Bullsnake Posted December 27, 2011 Author Share Posted December 27, 2011 Thank you BobWill, Indy, and Missourian. I've attached more pics, closer up, and of each end of the 'swollen stem', and both sides of the 'cup shape'. The Michelinia does look very similar, however it appears to have much thicker walls. Hope the new pics help. Thanks again guys! One end Other end Close up of disc Other side Steve Link to comment Share on other sites More sharing options...
piranha Posted December 27, 2011 Share Posted December 27, 2011 Fantastic fossils Steve... Congrats! Link to comment Share on other sites More sharing options...
Indy Posted December 27, 2011 Share Posted December 27, 2011 Thank you BobWill, Indy, and Missourian. I've attached more pics, closer up, and of each end of the 'swollen stem', and both sides of the 'cup shape'. The Michelinia does look very similar, however it appears to have much thicker walls. Hope the new pics help. Thanks again guys! One end Other end Close up of disc Other side The swollen stem...That's a crinoid stem. The swollen feature points to the crinoid continued to live after attacked by parasites...The swollen feature indicates healing prior to death. The "close up" views of the "Disc" Mmmm... Looks more like a crinoid calyx (as Missourian suggested) than the coral Michelinia. Interesting...I've never seen a crinoid calyx attacked so heavily by parasites. Nice Find Flash from the Past (Show Us Your Fossils)MAPS Fossil Show Link to comment Share on other sites More sharing options...
Bullsnake Posted December 27, 2011 Author Share Posted December 27, 2011 Thanks Scott! Thanks to all for the interesting ID's Steve Link to comment Share on other sites More sharing options...
Indy Posted December 27, 2011 Share Posted December 27, 2011 This one reminds me of a partial crushed crinoid calyx Flash from the Past (Show Us Your Fossils)MAPS Fossil Show Link to comment Share on other sites More sharing options...
Missourian Posted December 27, 2011 Share Posted December 27, 2011 The partial, fractured crinoid calyx could be Ulocrinus, which seems to pretty rare in these parts. thair has one in his gallery here: http://www.thefossilforum.com/index.php/gallery/image/12394-ulocrinus-sp/ Context is critical. Link to comment Share on other sites More sharing options...
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