Proterozoic dike with big feldspars.
Obverse of the sample here:
Proterozoic dike with biiiiiiiiiiiiiiiiig feldspars (and flow structures, in this case). Want to see the other side of this sample? Try this: gigapan.com/gigapans/187738
Reddish quartz in this Neoproterozoic metasedimentary rock.
Mariopteris, most likely Mariopteris nervosa, a liana-type seed fern from the early Carboniferous.
Big gravel bars in a Scabland channel, just downstream from Wilson Creek.
Belt Supergroup, northwestern Montana
Contact between two turbidite beds. Which way is up?
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