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BASEMAPS
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WEATHER
pre-Cenozoic metasedimentary and metavolcanic rocks undivided (CAm;0)
Geologic Formation
in
CA
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Lithology
Sandstone
Mudstone
Conglomerate
Other
(31,493 mi²)
Geologic Age
Paleoproterozoic – Cretaceous (2500 Ma – 66 Ma ago)
Geologic Unit Label
M
Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.
—
USGS
Taxonomy
Classified As
Geologic Formation
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