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Data Sources
Topo
Ecoregions
Public Lands
...
BASEMAPS
Default Weather
Temperature
Smoke
...
WEATHER
Arikaree Group
Geologic Formation
in
CO
,
NE
,
WY
,
SD
,
MT
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Lithology
Sandstone
Claystone
Siltstone
Other
(5,317 mi²)
Geologic Age
Oligocene – Miocene (33.9 Ma – 5.33 Ma ago)
(2,365 mi²)
Chattian – Miocene (28.1 Ma – 5.33 Ma ago)
(2,613 mi²)
Priabonian – Chattian (37.8 Ma – 23.03 Ma ago)
(50 mi²)
Other
(41 mi²)
Geologic Unit Label
Ta
(5,019 mi²)
Tar
(50 mi²)
Fossils
Minerisporites
GENUS
3
Observations
Triceratops
GENUS
2
Observations
Diceratherium
GENUS
2
Observations
Perotrilites
GENUS
1
Observation
Tracheophyta
PHYLUM
1
Observation
See All
Taxonomy
Geographic Places
307
Geological Feature
46
Geologic Formation
Classified As
Geologic Formation
Arikaree Group
Arikaree Group
Arikaree Group
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