Lighthawk
Weekend warrior
I wonder if any of our less geologically challenged members might comment on our observations seen in the western Sierra.
The granite contact at Grouse Ridge, where we see fine-grained dark stone, in many layers with quartz/white sheets and morphed xenoliths. John McPhee refers to the country rock, a morphed sedimentary rock being accreted as an island arc, later granitic batholiths erupted, add volcanics and glaciation, stir do not shake, and there you have our local cocktail of geology.
The granite contact at Grouse Ridge, where we see fine-grained dark stone, in many layers with quartz/white sheets and morphed xenoliths. John McPhee refers to the country rock, a morphed sedimentary rock being accreted as an island arc, later granitic batholiths erupted, add volcanics and glaciation, stir do not shake, and there you have our local cocktail of geology.
