Question

Protoliths - Van Hise Rock, Rock Springs, WI. The protolith (parent rock) of the pink/maroon rock at Van Hise Rock was a pure quartz sandstone (right side with orange field book), whereas the darker layer was originally a lens of clay-rich shale (middle). What metamorphic rocks did these protoliths (sandstone, shale) become

Answer 1

Based on the metamorphic rock at Van Hise Rock, Rock Springs, the protoliths will become quartzite and phyllite.

What rocks will the protoliths form?

The Sandstone(Quartz) will go through processes and eventually deform into the rock known as quartzite.

Shale will go through similar degradation processes to become the rock,  phyllite.

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