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A REVISED CLASSIFICATION OF THE ASHGILL SERIES

1970; Wiley; Volume: 3; Issue: 3 Linguagem: Inglês

10.1111/j.1502-3931.1970.tb01268.x

1502-3931

J. K. Ingham, Anthony D. Wright,

Pleistocene-Era Hominins and Archaeology

In addition to past errors in correlation and to lack of information, confusion over the lower boundary of the Ashgill Series has been brought about by a tradition of making the boundaries of the graptolitic zones fit a Standard Series based on an overwhelmingly shelly succession. In an attempt to resolve the difficulties, it is here proposed to regard the Pusgillian Stage of Bancroft as the lowest stage of the Ashgill Series. Two new stages, the Cautleyan and the Rawtheyan, are proposed for those sequences recently regarded as Lower and Middle Ashgill respectively, while Bancroft's term Hirnantian is revived as a stage name for the upper part of the Series.