The age of a rock is determined through the analysis of isotopes—minute amounts of radioactive elements in the rocks. The most common methods …
Search / 3 results found Showing: 3 of 3
The moraines of Wallowa Lake last saw glacial action as recently as 17,000 years ago.
It is well to remember that winter once was a constant here, when glaciers last reigned. Only 17,000 years ago, Wallowa Lake and the area betw…