- Source: Annona Chalk
The Annona Chalk is a geologic formation in Arkansas, Texas, Louisiana, and Oklahoma. It preserves fossils dating back to the Cretaceous period. The formation is a hard, thick-bedded to massive, slightly fossiliferous chalk. It weathers white, but is blue-gray when freshly exposed. The unit is commercially mined for cement. Fossils in the Annona Chalk include coelenterates, echinoderms, annelids, bivalves, gastropods, cephalopods, and some vertebrate traces. The beds range in thickness, up to over 100 feet in depth in some areas (such as at White Cliffs)., but thins to the east and is only a few feet thick north of Columbus, Arkansas and is completely missing to the east. The break between the Annona Formation and the Ozan Formation appears to be sharp with a few tubular borings up to a foot long extending down from the Annona in to the Ozan.
Exposures
Paleofauna
= Ammonites
=Baculites
B. crickmayi
B. taylorensis
Didymoceras
Didymoceratoides
D. binodosum
D. clardyi
Nostoceras
N. (Nostoceras) danei
N. (Nostoceras) monotuberculatum
N. (Nostoceras) plerucostatum
N. (Nostoceras) pulcher
Oxybeloceras
O. crassum
Pachydiscus
Placenticeras
= Ostracods
=See also
List of fossiliferous stratigraphic units in Arkansas
Paleontology in Arkansas
References
Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
Notes on the Annona Chalk, Norman L. Thomas and Elmer M. Rice, Journal of Paleontology, Vol. 6, No. 4 (Dec., 1932), pp. 319–329