GEOLEX

Summary of Citation: White Cliffs

Publication:
Hill, R.T., 1888, The Neozoic geology of southwestern Arkansas:
   Arkansas Geological Survey Annual Report, 1887-1892, v. 2,
   p. 1-260

Usage in Publication:
White Cliffs sub-chalk

Modifications:	Geologic Province:	Dominant Lithology:
First used	Ouachita folded belt province	Chalk

Summary:
First used as lowest formation of the Chalky marl beds division of the Upper Cretaceous or Exogyra costata series. Name apparently derived from exposures along the White Cliffs of Little River, sec 35, T11S, R29W, southeast Sevier Co, AR in Ouachita tectonic belt province. Consists of fossiliferous, impure chalk composed of glauconite and arenaceous grains cemented by calcareous matrix, 30 ft thick at White Cliffs. Fossils include INOCERAMUS BARABINI, BACULITES OVATUS, EXOGYRA COSTATA. Is lowest Upper Cretaceous horizon seen in AR. Is listed above Rocky Comfort (Niobrara) chalk; however, contact not observed in AR. Underlies White Cliffs chalk. [At the time this report was published, a Middle Cretaceous Series was recognized--to which the Rocky Comfort was assigned.]