Mississippian-aged Madison Group limestone, Bridger Range, Montana.
Obverse of this sample: gigapan.com/gigapans/185784
Bedding plane of green siltstone (to very fine sandstone), showing numerous life traces.
Devonian red beds, folded during Alleghanian mountain-building.
Flatlying strata from a Permian lake, exposed in coastal western "Mainland" Orkney
Chalk, chert, and basalt dominate the lithologies of these well-rounded beach cobbles.
Bed of coal along Corridor H, east of Bismark, West Virginia.
Fossil from the collection of Lisa Williams, biology professor at Northern Virginia Community College.
Cretaceous deep water clastics.
Obverse of this sample: gigapan.com/gigapans/185276
3D model of this sample: sketchfab.com/models/7fe94fbacda948beaae4737afb2f589c
Mudcracks in limey red shale with a mud chip and raindrop impressions.
Middle-Pennsylvanian Asterotheca miltoni from Mazon Creek, IL, USA.
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