Abstract

Twenty-seven Cenomanian planktonic foraminiferal species are described and some 60 specific names included in their synonymy. These species are from North America, Europe, and an Atlantic core N. of the Bahama Islands. Evidence of the planktonic Foraminifera suggests a Cenomanian (rather than Turonian) age for the N. Texas Eagle Ford group, an Eagle Ford (rather than Woodbine) age of the entire eastern Gulf subsurface Atkinson formation, and a mid to late Cenomanian (rather than Albian or early Cenomanian) age for the "Franciscan" strata at New Almaden, California. The family Rotaliporidae Sigal 1958, is recognized as distinct from the Globorotaliidae, and has been enlarged to include the subfamilies Hedbergellinae and Rotaliporinae. The Rotaliporidae have a geologic range from Hauterivian to Maestrichtian. The Planomalinidae Bolli, Loeblich and Tappan is recognized as of family rank, having been elevated from subfamily status by Sigal (1958), and the family Schackoinidae Pokorny, 1958, is also recognized as distinct from the Hantkeninidae and has a geologic range from Aptian to Maestrichtian. The Globorotaliidae and Hantkeninidae thus are of Cenozoic occurence.

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