The Pleistocene geology of the south central Sierra Nevada with especial reference to the origin of Yosemite Valley by Henry Ward Turner[.] With nine plates[.] Issued December 1, 1900. HENRY WARD TURNER.

The Pleistocene geology of the south central Sierra Nevada with especial reference to the origin of Yosemite Valley by Henry Ward Turner[.] With nine plates[.] Issued December 1, 1900. San Francisco: Published by the Academy, 1900. 25.5x19 cm, pp. [1-] 261-321 [322: blank], 9 inserted plates with eight photographic illustrations and one profile, original gray wrappers printed in black, fore-edges untrimmed. First edition. At head of title: "Proceedings of the California Academy of Sciences Third Series Geology Vol. I, No. 9." Turner, a member of the United States Geological Survey, studied Yosemite Valley in 1899. He concluded that its features were largely the result of stream erosion and weathering processes, facilitated by the jointed structure of the granite, and that glaciers had done little more than clear the valley of loose debris. However, he rightly insisted that the upheaval of the Sierra Nevada in pre-glacial time must have greatly accelerated the flow of the Merced River and caused that stream to entrench itself deeply. Currey and Kruska 338. Owner's name at upper right corner of front cover. Several short tears to spine panel repaired, wrappers just a bit sunned, title page tanned (interaction with wrappers), a very good copy. (#166709).

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