Eopolycotylus is a genus of polycotylid plesiosaur known from the Cenomanian-age Tropic Shale of Utah.
Dakotasuchus is a genus of goniopholidid mesoeucrocodylian. Its fossils have been recovered from the Cenomanian-age Upper Cretaceous Dakota Sandstone of Kansas. The type specimen was found in an iron-cemented sandstone concretion near Salina. This concretion was broken into two large pieces; more of the specimen was probably present originally, but by the time it was found only the torso and short portions of the neck and tail remained. Twenty pairs of bony scutes ran down the midline of the back. The vertebrae lacked the procoelous articulation of more derived crocodyliforms. Dakotasuchus had short broad shoulder blades, suggesting it had stout powerful forelimbs and perhaps terrestrial habits. M. G. Mehl, who described the genus, estimated the length of the type individual when complete to have been 3–4 metres (9.8–13.1 ft). The type species is D. kingi, named for Professor King, a former dean of Kansas Wesleyan University. Mehl did not classify his new genus to a more inclusive group than Mesosuchia. Robert Carroll assigned Dakotasuchus to Goniopholididae in 1988. In 2017, fossils of Dakotasuchus kingi which consisted of a coracoid, scutes, a dorsal vertebrate and postcranial bones were found in Utah, specifically in the Cedar Mountain Formation's Mussentuchit Member.
Paramacellodus is an extinct genus of scincomorph lizards from the Early Cretaceous of England and France, and the Late Jurassic of Portugal and the western United States. The type species, Paramacellodus oweni, was named in 1967 from the earliest Cretaceous (Berriasian) Purbeck Group in Dorset, England. Additional material referable to a species of Paramacellodus, possibly P. oweni, has been described from the Morrison Formation, specifically in Como Bluff, Wyoming, and Dinosaur National Monument, Utah. An indeterminate species is known from the Berriasian aged Angeac-Charente bonebed in France. Paramacellodus belongs to an extinct family of scincomorphs called Paramacellodidae, which spanned most of Laurasia during the Late Jurassic and Early Cretaceous and represented one of the earliest evolutionary radiations of lizards.
Morrolepis is an extinct genus of prehistoric coccolepidid "palaeoniscoid" ray-finned fish that lived during the Late Jurassic and earliest Cretaceous epochs in Europe, Asia and North America.
Guntherichthys is an extinct genus of prehistoric bony fish that lived during the late Mississippian/early Pennsylvanian in what is now Utah, United States. Fossils were recovered from the Manning Canyon Shale. The genus is named after Lloyd Gunther.
Spinofacia is an extinct genus of prehistoric bony fish that lived during the late Mississippian/early Pennsylvanian in what is now Utah, United States. Fossils were recovered from the Manning Canyon Shale.
The Thaynes Formation is a geologic formation in Montana and Idaho, United States. It was recently elevated to group status, as the Thaynes Group.
The Nopah Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.
The Weeks Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period and more specifically the Guzhangian stage. Its upper part has yielded a diverse fauna dominated by trilobites and brachiopods, but also comprising various soft-bodied organisms, such as Falcatamacaris. As such, it is regarded as a Konservat-Lagerstätte.
The Dunderberg Shale is a geologic formation in Nevada and Utah.
The Ely Limestone is a geologic formation in Nevada and Utah. It preserves fossils dating back to the Carboniferous period.
The Honaker Trail Formation is a geologic formation in Utah. It preserves fossils dating back to the Carboniferous period.
The Page Sandstone is a geologic formation in Utah. It preserves fossils dating back to the Jurassic period.
The Lehman Formation is a geologic formation in Utah. It preserves fossils dating back to the Ordovician period.
The Fillmore Limestone is a geologic formation in Utah. It preserves fossils dating back to the Ordovician period.
The Arcturus Formation is a geologic formation in Nevada and Utah, United States. It preserves fossils dating back to the Permian period.
The Thaynes Group, Thaynes Formation in older literature, is a geologic group in eastern Idaho, western Wyoming, Utah and eastern Nevada. It includes the Sinbad Formation, Virgin Formation and Shnabkaib Formation. The Thaynes Group is of marine origin. Its formations are interbedded with layers of the non-marine Moenkopi Group.
The Oquirrh Group is a geologic group in Utah. It preserves fossils dating back to the Carboniferous period.
The Kanosh Formation is a geologic formation in Utah and Nevada. It preserves fossils dating back to the Middle Ordovician period.
