All told these eight formations .
One group are 20,000 feet ( 6,100 m ) thick and are buried below much of the Cottonwood , Funeral , Grapevine , and Panamint ranges .
All told these eight formations and one group are 20,000 feet ( 6,100 m ) thick and are buried below much of the Cottonwood , Funeral , Grapevine , and Panamint ranges .