WHO WE ARE

Yellowstone Valley Rock Supply is a locally owned and operated business in Billings, MT. All rock that we supply is excavated south of Laurel, MT.

GEOLOGICAL HISTORY

The rock from comes from the sandstone layers found in the Mowry Formation. The Mowry was formed during the Upper Cretaceous period approximately 145 million years ago. The sandstone layers within the Mowry Formation are described by MBMG as; very fine- to fine- grained sandstone beds that are highly silicified, very hard quartzite.