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MAP

Topo

Rock Formations

Measure

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Topo

Ecoregions

Public Lands

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BASEMAPS

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Temperature

Smoke

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WEATHER

Lodgepole Formation (MTMl;0)

Geologic Formation in MT

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Lithology

Conglomerate

Conglomerate

Mudstone

Other (814 mi²)

Geologic Age

Tournaisian – Visean (359.3 Ma – 331.1 Ma ago)

Geologic Unit Label

Ml

Woodhurst Member (upper part of formation): light gray, well-bedded limestone, typically with much dark chert, interbedded with thinner calcareous mudstone beds. Paine Member (middle part of formation):dark gray, thin-bedded, silty or fossiliferous limestone. Cottonwood Canyon Member (lower part of formation): black shale with basal conglomeratic lag deposit. Shallow marine. Thickness as much as 305 m (1000 ft).

— USGS

Taxonomy

Classified As

Geologic Formation