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Richards 1964

Richards, A.F. (1964). Geology of the Islas Revillagigedo, Mexico; [Part] 4, Geology and petrography of Isla Roca Partida. Geological Society of America, Bulletin 75(11): 1,157-1,164.

This island, located southwest of Baja California, Mexico, is probably a remnant of the volcanic neck of a composite volcano. The summit has been eroded by wave action, and a broad insular shelf at about 80 fathoms indicates past eustatic sea-level lowering during the Pleistocene. The rock is trachyandesite, similar in composition to the alkali basalt-sodic rhyolite types of the other three Islas Revillagigedo.

Keywords
Cenozoic, changes of level, erosional history, eustatic, geomorphology, igneous rocks, Isla Roca Partida, Islas Revillagigedo, Mexico, Pacific coastal islands, petrology, Pleistocene, Pleistocene, eustatic changes of level, Quaternary, trachyandesites, volcanic, rocks, volcanism, 05 Igneous and metamorphic petrology, 23 Geomorphology

Journal
Geological Society of America, Bulletin
http://www.geosociety.org/pubs/index.htm

Publisher
The Geological Society of America
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Boulder, CO 80301
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