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This article contains a list of fossil-bearing stratigraphic units in the state of Arkansas, U.S. Sites. Group or Formation Period
Southern and northeastern Arkansas were likewise covered by the sea into the Cretaceous. Local life left behind many fossils. [4] During the Early Cretaceous, the region of Arkansas southeast of the Ouachita Mountains was submerged by the Gulf of Mexico. [8] The invertebrates of Arkansas's Cretaceous sea included clams, echinoids, oysters, and ...
Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes †Archimylacris †Archimylacris venusta – type locality for species †Arkacrinus †Arkacrinus dubius †Arkanites †Arkanites relictus †Arkoceras †Arkoceras exiguum †Asketomorpha – type locality for genus †Asketomorpha grandis – type locality for species ...
Fossil of the Middle Ordovician-Silurian trilobite Sphaerexochus †Sphaerexochus †Spirifer †Stearoceras †Stigmaria †Stroboceras †Sutherlandia †Tesuquea †Triboloceras – tentative report †Tripteroceroides – tentative report; Trypanites †Tylonautilus †Valhallites †Wilkingia †Zia
The Ouachita Mountains (/ ˈ w ɒ ʃ ɪ t ɔː /), simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma.They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, one of the important orogenic belts of North America. [3]
The Ouachita orogeny was a mountain-building event that resulted in the folding and faulting of strata currently exposed in the Ouachita Mountains. The more extensive Ouachita system extends from the current range in Arkansas and Oklahoma southeast to the Black Warrior Basin in Alabama and to the southwest through the Llano , Marathon , and ...
This list of the Mesozoic life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas and are between 252.17 and 66 million years of age.
The cache of fossils at the Conard Fissure was a breathtaking scientific discovery in its own right, yet Barnum Brown was fresh off his field work in Hell Creek, Montana just the year prior. Therefore, the Conard Fissure excavation was somewhat overshadowed by the enormity of the Tyrannosaurus discovery and not published until 1908.