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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
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Publisher
The Geological Society of America
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