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Showing results for tags 'early ordovician'.
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Just a note that James Cullison's 1944 monograph on the rocks and fauna of the upper Lower Ordovician of Missouri and Arkansas is now freely available for download or perusal at https://archive.org/details/paper-cullison-1944-the-stratigraphy-of-some-lower-ordovician-formations-of-the This publication has always been devilishly tough to get a hold of. A nice systematic paleontology section deals with the many gastropods and other mollusks as well as the less diverse brachiopods, trilobites, and sponges. The monograph covers the following formations as currently accepted in Missour
b. bartron posted a topic in Fossil IDSouth central Missouri. Probably gasconade formation but possibly eminence formation (late Cambrian)
Xiphosuran from Baltic Early Ordovician
D.N.FossilmanLithuania posted a topic in Fossil IDDear Guys, I recently found one small (5 mm width) and interesting specimen that can belong to primitive xiphosuran by the appearance of cephalothorax. It has not any jaws as trilobite and the preserved eye is merostomate like (not any small eyes but only protuberant area, similar to eurypterid or other chelicerate eyes). The rick is found in Varena town, South Lithuania and the age should be about 475 million years. Please help to confirm the primitive chelicerate if you could. Regards Domas
Another early ordovician object - coiled cephalopod?
allanstaib posted a topic in Fossil IDReally enjoying participating in this forum! I've found this object in the Cotter/Jefferson City formation in Marion County Arkansas (Ozarks). At the widest point it is 27mm in diameter. From photos of other similar fossils from the early Ordovician it looks like a coiled cephalopod but seems to have a smoother shell than other examples I've seen. The rock structure is really interesting; a real chaotic aggregate. Thanks for any comments!