Fine-grained sedimentary rocks, commonly referred to as "shale" or "mudstone", constitute approximately two thirds of the sedimentary column on Earth, and are nonetheless the least understood ...
What Was Happening on Earth at This Time The Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary rock. Laid down over millions of years ...
“Grand Sentinel” is a target on the opposite side of our previous workspace, allowing us to document it from a different angle. “Tunnel Rock” and “Tombstone Ridge” are sedimentary rocks that may have ...