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The bedrock strata of the northern Sierra Las Pintas are approximately 520 m thick and are here divided into six informal units of formational rank: unit SP1, calcareous sandy siltstone and calcareous siltstone; unit SP2, siltstone interbedded with calcareous siltstones, crinoidal grainstone, and granule conglomerates; unit SP3, graded crinoidal grainstone; unit SP4, massive and normally graded beds of coarse sandstone and granule to cobble conglomerate; unit SP5, basalt flows with pillow breccia and hyalotuffs; and unit SP6, bedded chert and calcareous argillite in thrust contact with underlying units. Lophyophyllid corals and brachiopods from unit SP3 suggest a Carboniferous age.


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