The Annona Chalk is a geologic formation in Arkansas, Texas, Louisiana, and Oklahoma.[2] 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.[3] The beds range in thickness, up to over 100 feet in depth in some areas (such as at White Cliffs).,[4] 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.[5]
^Hill, R.T. (1894). "Geology of parts of Texas, Indian Territory and Arkansas adjacent to Red River". Bulletin of the Geological Society of America. 5: 308.
^USGS Geolex, Annona Chalk/Formation
^R. T. Hill. "Annona Chalk Formation". Arkansas Geological Survey. Arkansas Geological Survey. p. 308. Archived from the original on May 27, 2010. Retrieved 25 May 2015.
^Veatch, Arthur Clifford (1906). Geology and Underground Water Resources of Northern Louisiana and Southern Arkansas. U.S. Government Printing Office.
The AnnonaChalk is a geologic formation in Arkansas, Texas, Louisiana, and Oklahoma. It preserves fossils dating back to the Cretaceous period. The formation...
arachoides V. gapensis V. ozanana Velarocythere V. reesidei Hesperornis AnnonaChalk overlying Ozan Formation at what is now called White Cliffs Natural Area...
Collins, Jr., Robert J. (June 1960). Stratigraphy and Ostracoda of the Ozan, Annona, and Marlbrook Formations of southwestern Arkansas (PhD). Louisiana State...
jambu (Acmella oleracea), contains spilanthol Graviola oil, derived from Annona muricata Tucumã oil, from Astrocaryum aculeatum is used to manufacture soap...
Annonaceae: custard apple family Annona: custard apples Annona cherimola cherimoya Annonaceae (custard apple family) Annona glabra pond apple Annonaceae (custard...
particular cap (pilleus) marked a slave who didn't come with a warranty; chalk-whitened feet were a sign of foreigners newly arrived in Italy. A rare depiction...
Roman Stone Inscriptions of Cologne, abbreviated RSK), Cologne (1975). Annona Epigraphica Austriaca (Epigraphy of Austria Annual, abbreviated AEA) (1979–present)...
star apples and various members (guanabana, chirimoya and others) of the Annona family were obtained, traded for mantles, emeralds and salt. Other big festivity...
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