PHOTOMICROGRAPH

Crystalline Basement Rocks

Shocked Quartz Grains

2-A Core--445 feet

Numerous quartz grains show the heavy concentration of planar deformation features and the brownish "toasting" that characterizes Manson shocked quartz. The white edges of the grains were partially melted and have recrystallized. The black regions are voids.

field 3.2 x 2.1 mm
cross-polarized light