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Absaroka Volcanic Supergroup: Washburn Group (WYTaw;0)
Geologic Formation
in
WY
,
MT
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Lithology
Andesite
Dacite
Geologic Age
Eocene (56 Ma – 33.9 Ma ago)
Geologic Unit Label
Taw
Includes Sepulcher Formation (andesitic and dacitic volcaniclastic rocks), Lamar River Formation (andesitic lava and volcaniclastic rocks), and Cathedral Cliffs Formation (light-colored andesitic volcaniclastic rocks).
—
USGS
Fossils
Petrified Tree
19
Occurrences
Fagales
ORDER
6
Observations
Oak Fossil
Quercus (genus),
“The Oak Genus”
4
Observations
Magnolia Fossil
Magnoliaceae (family),
“Magnolia Family”
3
Observations
Maple Fossil
Sapindaceae (family)
3
Observations
See All
Taxonomy
Geographic Places
307
Geological Feature
46
Geologic Formation
Classified As
Geologic Formation
Absaroka Volcanic Supergroup: Washburn Group (WYTaw;0)
Absaroka Volcanic Supergroup: Washburn Group (WYTaw;0)
Absaroka Volcanic Supergroup: Washburn Group (WYTaw;0)
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