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Mapping along the eastern coast of Baja California adjacent to the Canal de Las Ballenas (lat. 29°30′ to 29°40′) reveals over 4,000 m of complexly folded and faulted, metamorphosed sedimentary and volcanic strata, locally intruded by tonalite and gabbro of Cretaceous age.

Protoliths include lime mudstone, coarse-grained bioclastic packstone, bedded black chert and shale, thin-bedded flysch-type sandstone-shale, thick boulder and cobble conglomerates, minor quartz arenite, and pillowed alkaline basalt. The depositional environment was anoxic slope to basin. The entire sequence is here named the Canal de Las Ballenas Group.

Conodont fragments and favositid corals indicate a Devonian age, suggesting correlation...

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