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a group of more bird-like theropods including Tyrannosaurus
Also present is a significant portion of the preserved keel
It contains two currently recognized species
This genus of ammonite is small to large-sized with evolute coiling and deep
and the tip shows almost no ware facet
Eocene Green River Unidentified Calyx P-PCM-16-084 Brittle Star a group of more bird-likeUnidentified Calyx Green River Formation Parachute Creek Member Middle Eocene Uintah County, Utah This is a very well preserved but unidentified calyx. It has 4 sepals, but it appears that there are no petals present. The calyx is very coriaceous and has a heavy carbon residue of carbon. The upper part of the Green River Formation in the eastern Uinta Basin is present in two stratigraphic intervals separated by approximately 250 m of sandstone,
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