fractured Proterozoic metamorphic basement rock
![fractured Proterozoic metamorphic basement rock](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/PonchaCyn_frac_Xrxs.jpg?itok=X1kuCTVL)
Detailed Description
Intensely fractured Proterozoic metamorphic basement rock exposed in Poncha Canyon. Systematic structural measurements of fractures in such old rocks indicate a protracted history of brittle deformation in the core of Poncha mountain block that continued into recent rift-related extensional faulting.