This is a recent unpublished document by the late Howard E. Schorn. His objective was to perform a review of the categorization of the Chalk Bluff fossil folia assemblage and to point out errors in the interpretation of the ages through the evolution of various workers’ contributions. This document has some problems diplaying illustrations because of compatibility problems with formats.
Schorn, Howard E., 2012, A Historical Review Of The Age Assignments Applied To The Chalk Bluff Fossil Plant Assemblage, Central Sierra Nevada, California; unpublished.