Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1968 GEOLOGICAL SURVEY BULLETIN 1 2j9 4 - A Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1968 By GEORGE V. COHEE, ROBERT G. BATES, and, WILNA B. WRIGHT CONTRIBUTIONS TO STRATIGRAPHY GEOLOGICAL SURVEY BULLETIN 1294-A UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1970 UNITED STATES DEPARTMENT OF THE INTERIOR WALTER J. HIGKEL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.G. 20402 - Price 35 cents (paper cover) CONTENTS Pace Listing of nomenclatural changes-----____________ At Ortega Quartzite and the Big Rock and Jawbone Conglomerate Members of the Kiawa Mountain Formation, Tusas Mountains, New Mexico, by Fred Barker__________________ ___________________ 21 Reasons for abandonment of the Portage Group, by Wallace de Witt, Jr__ 2& Tlevak Basalt, west coast of Prince of Wales Island, southeastern Alaska, by G. Donald Eberlein and Michael Churkin, Jr___.________ __ 25 Formations of the Bisbee Group, Empire Mountains quadrangle, Pima County, Arizona, by Tommy L. Finnell-_______________________ 28 Glance Conglomerate.___-_---__--___--__-_______-_____________ 30 Willow Canyon Formation____________________________________ 31 Apache Canyon Formation_____________________________-__-____ 32 Shellenberger Canyon Formation________________________________ 32 Turney Ranch Formation____________________________________ 33 Age_____ __ _ _ ____-----__-__ 34 Pantano Formation, by Tommy L. Finnell__________________________ 35 Bardstown Member of the Drakes Formation in central Kentucky, by Warren L. Peterson____________________________________________ 36 The Cantwell Formation of the central Alaska Range, by Jack A. Wolfe and Clyde Wahrhaftig_________________________________-_________ 41 References cited___________________________________________________ 46 ILLUSTRATIONS FIGURE 1. Generalized geologic map of the Tlevak Strait area, south­ eastern Alaska._______________________________________ A27 2. Index map of the Empire Mountains area, Arizona-_________ 29 3. Index map showing the location of the type section of the Bardstown Member of the Drakes Formation-.___________ 37 4. Geologic sketch map of the central Alaska Range showing the distribution of the Cantwell Formation, related formations, and localities referred to in text__---------_-_--_--__--__ 42 in CONTRIBUTIONS TO STRATIGRAPHY CHANGES IN STRATIGRAPHIC NOMENCLATURE BY THE U.S. GEOLOGICAL SURVEY, 1968 By GEORGE V. COHEE, ROBERT G. BATES, and WILNA B. WRIGHO? LISTING OF NOMENCLATTJRAL CHANGES In the following table, stratigrapkic names adopted, revised, re­ instated, or abandoned are listed alphabetically. The age of the unit, the revision, and the area involved, along with the author's name and date of publication of the report, are given. The publications in which the changes in nomenclature were made are listed in the references at the end of this publication. The capitalization of age terms in the ag& column follows official usage. One of the significant nomenclature changes in 1968 was the adop­ tion by the U.S. Geological Survey of Holocene to replace Recent (Cohee, 1968). Holocene, meaning "wholly recent" and referring to the percentage of living organisms, originally was proposed as a "stage" following the Pleistocene "stage" by the Portuguese committee to the Third International Congress of 1885 (Morrison and others, 1957). At the annual meeting of the American Commission on Stratigraphic Nomenclature, November 22, 1967, the Commission endorsed the use of Holocene instead of Recent and expressed the hope that the term "Holocene" would be adopted officially by various geological organi­ zations. The formal term "Recent" was ambiguous in referring to sedimentary deposits, fossils, and present-day shells involving "Re­ cent" or recent time. 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