|Mima mounds south of Seattle, Washington|
|Mounds in the Yokohl Valley region in the Sierra foothills near Sequoia National Park.|
|Mima mounds near Willms Road in the Sierra Nevada foothills near Knights Ferry on the Stanislaus River.|
I was pleased to run across some current research on the origin of these enigmatic mounds by Manny Gabet at San Jose State University, and the verdict is...gophers. Generation after generation of gophers, building their mounds in the same place over time. Gabet doesn't insist that this is the absolute explanation for all mounds, but the computer modeling provides strong support for the idea. The mounds would develop after around 500-700 years.
|Snow patches outline mima mounds at Tehachapi Pass in southern California (photo by Mrs. Geotripper).|
Sorry, alien lovers...maybe Roswell has some new evidence.