Scientists have found previously undocumented ash deposits buried beneath the Lava Creek Tuff in Wyoming — and at least one ...

once you've been trained to identify minerals, you can use those skills to give a rock its proper name. The countertop has quartz, plagioclase feldspar, potassium feldspar and biotite? That is ...

Noteworthy sulfides including chalcopyrite, galena, sphalerite and pyrite prevailing over a continuous drill interval of ...