Shorter contributions to general geology, 1919 /

Abstract

Background of present revision ___________ .. __________ _ General setting ______ ______ ____________________ _ Outline of investigation and summary of conclusion __ Revised stratigraphic section ____ _____ ______________ .. _ General features ________ ________________ _______ _ Jurassic system _____ _____________________ ______ _ Regional nomenclature __ ___________________ _ Arapien shale ________ ____. ________________ _ Definition, distribution, and general strati-graphic relations __ ______ _____________ _ Lithologic character, subdivision, and thick