. Bulletin of the Department of Geology. Geology. Vol. 6] Merriam: Notes on Desmostylus. 407 the mouths of rivers; its known geographic distribution ex- tended around the north Pacific from southern California to Japan; its geologic range in America is found in a zone near the base of the Miocene. As the time equivalence of the for- mations in which Desmostylus occurs is not yet fully understood, later study may show that the downward limit of range corre- sponds to the Oligocene or that the upper limit corresponds to middle Miocene. DENTITION The teeth of Desmostijlits, as known from the Cali
. Bulletin of the Department of Geology. Geology. Vol. 6] Merriam: Notes on Desmostylus. 407 the mouths of rivers; its known geographic distribution ex- tended around the north Pacific from southern California to Japan; its geologic range in America is found in a zone near the base of the Miocene. As the time equivalence of the for- mations in which Desmostylus occurs is not yet fully understood, later study may show that the downward limit of range corre- sponds to the Oligocene or that the upper limit corresponds to middle Miocene. DENTITION The teeth of Desmostijlits, as known from the Californian specimens (figs, la to 2b), consist of several pairs of high pillars. Figs, la and 16. Desmostylus, sp. M\ X Lower Miocene, north of Coalinga (NW % see. 29, T. 18 S, R. 15 B). Collected by Robert Anderson. Fig. la, lateral view; fig. lb, occlusal view. Figs. 2a and 2b. Desmostylus, sp. Mw no. 9091, X V>. California, exact locality unknown. Fig. 2a, lateral view; fig. 2b, occlusal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University Press
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