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A chart (PI. 58) showing the correlation of the Ozarkian and Canadian formations of the eastern half of United States and Canada and western Newfoundland represents the most recent views of the senior author.

Alden Formation—lower half of Upper Canadian of Oklahoma, containing Ceratopea faunules.

Arbuckle Limestone—a great sequence of limestones ranging in age from middle Upper Cambrian to youngest Upper Canadian. This term should be discarded as too inclusive and indefinite. The original contents of the “formation” have already been divided into 12 formations, four of them (Honey Creek, Fort Sill, Royer dolomite, and Signal Mountain) being of Upper Cambrian age; four of them (Chapman Ranch formation, McKenzie Hill limestone, Wolf Creek dolomite, and Gasconade) being of Ozarkian age; and the remaining four beginning with an otherwise unnamed Lower Canadian limestone, 1100 feet in thickness, Cool Creek limestone (Middle Canadian) 600 to 1200 feet, and two Upper Canadian formations—the Alden limestone, marked by a number of Ceratopea zones and the more thinly bedded West Spring Creek limestone—with a combined maximum thickness exceeding 3300 feet. When the desired information is available the “Arbuckle limestone” fossils described or mentioned are referred to the particular formational unit from which they were collected. Faunas, at times, of northern, at other times, of southern origin.

Axeman Limestone—a fossiliferous, pure, Upper Canadian limestone, 158 feet thick, at Bellefonte, Pennsylvania. Here it rests on about 500 feet of dolomite containing unquestionable Cotter fossils; it is succeeded by the Bellefonte . . .

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