The Yellowstone region's Beartooth Mountains feature some of the most ancient rocks in North America — as old as 3.96 billion ...

These crystals will grow and interlock to form a hard crystalline rock ... allowing time for larger crystals to be formed. Sedimentary rocks close sedimentary rockSedimentary rocks are those ...

Yellowstone volcanism has produced some of the youngest rocks in North America. This same region also features some of the ...

The study shows that the petrographic, geochemical and spectroscopic features in the graphite (the crystalline form of carbon) found in the Saglek-Hebron chemical sedimentary rocks are in fact ...