Sacramento: California Journal of Mines and Geology, 1935. First Thus. INSCRIBED on front cover 'To Robert Linton:/With the compliments of the author, in sincere appreciation of your/suggestions and aid in the collection and recording of the data/incorporated in this paper. s/J.Clark Sutherland'. Octavo; 51-87pp. A Very Good copy in stapled wrappers; offprint of California Journal of Mines and Geology, Report XXXI of the State Mineralogist, January, 1935. Item #19850
'In this paper the author seeks to describe the geological relations and properties of the more important clay producing areas in Riverside and Orange Counties, Southern California. As a result of his work he finds that the clays are found in a particular Tertiary formation, of Martinez age. They were deposited under continental conditions at the edge of a gradually encroaching sea. The clays are invariably associated with lignitic shales and coals and thus represent deposition in a humid, probably temperate climate under extremely reducing conditions. ' (CODA).