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GeoRef Subject
cross-stratification
clastic rocks
Cretaceous
Cenozoic
planar bedding structures
Chordata
Mesozoic
North Dakota
Paleocene
sedimentary structures
Tullock Member
Upper Cretaceous
Hell Creek Formation
Paleogene
lower Paleogene
Ludlow Member
Montana
sandstone
Tertiary
siltstone
United States
Vertebrata
stratigraphy
sedimentary rocks
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