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Cambrian limestone and dolomite (WACAls;0)

Geologic Formation in WA

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Lithology

Conglomerate

Argillite

Phyllite

Other (758 mi²)

Geologic Age

Early Cambrian – Middle Ordovician (542 Ma – 459.3 Ma ago)

Geologic Unit Label

CAls

Mostly massive dolomite, with a basal unit of gray to dark-gray limestone interbedded with limy shale, and an upper unit of fine-grained massive limestone with some marble; Pend Oreille and northern and central Stevens Counties. Three-fold division less evident in Colville area. Dolomite, with minor basal unit of interbedded limestone and phyllite in the Addy-Dunn Mountain area of Stevens County. Marble, dolomite, limestone, and limy slate in Hunters’ district. Dolomitic marble in southern Stevens and northern Lincoln Counties. Middle Cambrian fossils near base in Metaline district, and Bathyuriscus-Elrathina fauna in lower unit in Leadpoint district. Phosphatic brachiopods in upper unit in Leadpoint district tentatively assigned to Middle and Upper Cambrian.

— USGS

Taxonomy

Classified As

Geologic Formation