. Annual report of the United States Geological Survey to the Secretary of the Interior . section on Little River, Arkansas. Anona chalk.—This bed is composed of the purest white chalk, theWhite Cliffs chalk of the writers earlier papers. It occurs in Texasin the vicinity of Clarksville and Anona, Red River County, and istypically exposed in Arkansas along the White Cliffs of Little Riverin Hempstead and Sevier counties, where it has a thickness of about100 feet. Washington beds.—The Washington beds, surmounting the Browns-town marls, are composed of glauconitic sands. The glauconite occurs 1
. Annual report of the United States Geological Survey to the Secretary of the Interior . section on Little River, Arkansas. Anona chalk.—This bed is composed of the purest white chalk, theWhite Cliffs chalk of the writers earlier papers. It occurs in Texasin the vicinity of Clarksville and Anona, Red River County, and istypically exposed in Arkansas along the White Cliffs of Little Riverin Hempstead and Sevier counties, where it has a thickness of about100 feet. Washington beds.—The Washington beds, surmounting the Browns-town marls, are composed of glauconitic sands. The glauconite occurs 1 Since this paper was written Mr. J. A. Taff, of the U. S. Geological Survey, has made a BtUl laterstudy of the areas of the Navarro formation in southwestern Arkansas in connection with theireconomic products. His report will appear in the Twenty-second Annual Report of the Survey. 2Geology of parts of Texas, Indian Territory, and Arkansas adjacent to Red River; Bull Geol. Soc. America, March, 1894, pp. 297-238. U. S. GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PART VII PL. XLVII. CHARACTERISTIC FOSSILS OF THE TAYLOR AND NAVARRO , la. Exogyra costata Say 2. Gryphaea vesicularis Lamarck, ILLINOIS CORRELATION OF THE NAVARRO FORMATION. 341 in so great abundance as to give the deposits the character of the marlbeds which are worked for fertilizers in New Jersey, with which theseArkansas beds seem paleontologically identical. These beds are notpositively identifiable in Texas, being mostly overlapped by the Ter-tiary formations. Arli<tlim h,i/s.—The arenaceous Washington beds axe succeededin Arkansas by a very black, compact, laminated clay shale, with thinpartings of ferruginous sand, as exposed at Arkadelphia, is a formation concerning the age of which the writer expresseddoubt in his report upon Arkansas, and provisionally considered it thebase of the Eocene. The subsequent investigations of Harris resultedin paleontologic determinations
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