EPawsF15 Posted March 18, 2021 Share Posted March 18, 2021 I have no information about the origin of this fossil, except to say that it came from a large bag of pea pebbles purchased at a big box store in the St. Charles, Missouri area. The raised ridge in the center made me wonder if it's a trilobite. There's also an interesting "shift" about midway down the ridge that creates an offset of sorts. Maybe that's the result of settling over time? It measures about 0.75 inch long, as shown in one of the photos. Link to comment Share on other sites More sharing options...
Fossildude19 Posted March 18, 2021 Share Posted March 18, 2021 You are correct. This is a partial trilobite, part of the thorax and pygidium. It was probably a molt, which is why the pygidium is offset from the thorax. Looks like perhaps a Dalmantid trilobite. 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...
piranha Posted March 18, 2021 Share Posted March 18, 2021 The axis is too tall for a trilobite and the axial rings would not have a connecting ridge. 1 2 Link to comment Share on other sites More sharing options...
FossilDAWG Posted March 18, 2021 Share Posted March 18, 2021 This one is weird! It has an echinoderm-ish feel to it but I am not sure. It might be an impression, in which case one would have to imagine it pressed into modeling clay to see the "positive" surface. Don 1 Link to comment Share on other sites More sharing options...
daves64 Posted March 18, 2021 Share Posted March 18, 2021 It sort of, almost, but not quite, looks like fish vertebrae & ribs.. or a mold of a mold of some. Accomplishing the impossible means only that the boss will add it to your regular duties. Link to comment Share on other sites More sharing options...
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