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WEATHER
Willwood Formation
Geologic Formation
in
WY
,
MT
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Lithology
Conglomerate
Sandstone
Shale
Other
(1,805 mi²)
Geologic Age
Eocene (56 Ma – 33.9 Ma ago)
Geologic Unit Label
Twl
Variegated claystone, shale, and sandstone; some lenticular gold-bearing quartzite conglomerate.
—
USGS
Taxonomy
Classified As
Geologic Formation
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