Abstract
Considerable confusion has existed concerning the D beds of the Speeton clay (lower Cretaceous) in eastern Yorkshire, northern England, part of which arose from misidentification of ammonites. The D 2 -D 3 boundary is therefore redefined, and, to avoid any further confusion, a definitive section of the upper D beds is described.
GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
