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Here is another specimen from the Southgate Hill road cut near St. Leon, Indiana. So it is Richmondian, Cincinnatian, Late Ordovician in age, Upper Arnheim, Waynesville, or Liberty Formations found in a rock with multiple Strophomena planumbona, lots of tiny ramose bryozoan fragments and some crinoid columnals. At first I thought it was an echinoderm of some ilk, but now I'm leaning towards a fragment of the bivalve Caritodens welchi like the one Ralph @Nimravisposted in this thread : The bit I have is about a centimetre long and 1.5 mm wide. Thank you, as always, for any suggestions. N.B. This specimen was also sent to me by Ralph. Thanks again, my friend. @erose @connorp Thanks, everyone.

Hello, my friends, tis I once more with queries regarding odds and ends found in matrix from Southgate Hill road cutting, St. Leon, Indiana. Late Ordovician from the Upper Arnheim, Waynesville, Liberty and Lower Whitewater formations. Is this first one a bit of free cheek with a spine base? The piece is 1.5 mm wide and the big brachiopod bottom left is the edge of a Strophomena planumbona. I am pretty certain that this next one is a hypostome. It looks like some of the Isotelus ones I have seen but is very small. 2.5 mm. A small Isotelus? Another trilo? Or the Millennium Falcon? I think this is another hypostome. But of what? It's actually in the same rock as the one above but is a little bigger at 3 mm from tip to tip. Closer look : This one's enormous by comparison, 1.9 cm from curve to tip. But I'm not sure it is a hypostome. It sort of looks like part of the internal structure of a brachiopod or bivalve but I can't for the life of me think what. Especially at this size. Close up : Are these ostracods? Quite a lot of them in this rock, 0.5 to about 1 mm wide : @connorp @erose @Kane @piranha @ClearLake And all comments welcome from anyone else. Thank you all very much for any assistance.

Hello, once again, my friends. Another puzzle from the Southgate Hill road cutting near St. Leon, Indiana. It will be Cincinnatian, Late Ordovician in age from the Waynesville or Liberty or Formations. The rock it is in also contains Strophomena planumbona, Eochonetes clarksvillensis, Zygospira modesta and Bythopora deliculata. The shape and growth lines seem to me like the inarticulate brachiopod Pseudolingula, but the 'ribs' and 'tubercles' wouldn't fir this. Looking more closely it seems to have a bryozoan structure, so is it a brachiopod covered in an encrusting bryozoan? Or just a weird bryozoan? My other thought is some sort of trilobit, a hypostome, maybe? Also bryozoan covered? Any of your opinions will be gratefully received. Thank you It is 4 mm wide. Here it is with a tiny Zygospira modesta : And as close as I can get : Each 'level' gets progressively higher but the total height of the specimen can't be much more than a mm.

Hello, friends! This bryozoan is tiny, about a mm wide. It seems to be made up of overlapping tubes arranges diagonally across the zooarium. It come from the Southgate Hill road cutting, St. Leon, Indiana and I think is from the Liberty Formation, Cincinnatian, Late Ordovician due to other species found in the same piece of rock. The other species include Xenocrinus baeri, Hebertella occidentalis, Zygospira modesta, Graptodictya perelegans, Bythopora deliculata, Batostoma sp. and Stictopora emacerata. I think. Thank you for looking.

Any ideas on this? Found at Southgate hill. Ordovician