Pink Devonian intrusive
Nice big crystal of potassium feldspar w/ exsolution lamellae.
Cobble collected from the Salmon River at Hammer Creek, Idaho.
Meteorite impactite layer? Volcaniclasitics?
YOU be the judge.
Flip side of this sample: gigapan.com/gigapans/190109
Oceanic crust looks like this after it has been sheared out and metamorphosed in a subduction zone. Part of the Franciscan Complex.
southern Lake Myvatn
Reddish quartz in this Neoproterozoic metasedimentary rock.
more details later
Chalk, chert, and basalt predominate.
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