Waterton Park Canada
Reddish quartz in this Neoproterozoic metasedimentary rock.
Possible Eriboll Formation protolith, since it appears to be dominated by quartz.
Post-pressure-washing image of the sample is here:
Stem with needles, or a raggedy cone (?), Conemaugh Formation, Corridor H.
Blue Lagoon Iceland
Blick vom Bärenstein in Richtung Keilberg und Fichtelberg
Some of the oldest chert in the world.
A nice example of cross-stratification in a fine sandstone
44 34 46 N 108 2 44 W - Facing North
Chalk, chert, and basalt predominate.
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