Procraspedites from the Mexican Altiplano, studied with precise stratigraphic control, are coeval with the horizons rich in Glochiceras (Coryceras) carinatum [Del Castillo and Aguilera. 1895]. The interval with Procraspedites is dated as Eudoxus Chron (p.p.) of the Submediterranean late Kimmeridgian. The presence of parabolic structures on the inner whorls, followed by double furcations in Procraspedites, indicates Ataxioceratinae. The type species Procraspedites praecursor [Burckhardt, 1906] is interpreted to be the only valid species of this genus in the Americas.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.