spilite

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spilite

(ˈspaɪlaɪt)
n
(Minerals) a type of igneous rock
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South of the Puerto Nuevo block the San Hipolito Formation is represented in the eastern vicinities of the San Jose de Castro--Bahia Asuncion Road, by serpentinites and spilites; in the Sierras El Chorrito and Los Ajos (some 5 km east of Puerto Nuevo), and in the valley of Arroyo San Cristobal (FIGURES 16 and 17) by abundant ophicalcites, spilites, volcano-sedimentary strata, thin bedded gray siliceous deposits, radiolarites, with interbedded limestone and pink dolomite; on either side of the Puerto Nuevo Canyon, at about 2 km from Puerto Nuevo, by ophicalcites, light gray limestone, and some sandstone.
North of the Puerto Nuevo block the San Hipolito consists, in a hill some 3 km northeast of Puerto San Jose, of spilites and volcano-sedimentary strata; in a almost continuous strip that from a point about 2 km southwest of San Jose de Castro extends itself into the Ranchs of Santa Monica and San Miguel, reaches the Puerto Nuevo Canyon and continues in the Sierra de Puerto Nuevo, of spilites, pillow lavas, red radiolarites, sometimes coarse volcano-sedimentary strata, with both interbedded limestone and minor pink dolomite.
The fault scarp shows variable heights, the greatest relief (80-120 m) being observed upon slopes built up of spilites.