Packrat middens
By Geosciences and Environmental Change Science Center
July 2016 (approx.)
![Photograph of packrat middens](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/packratmidden.jpg?itok=Bk8y3fh5)
Detailed Description
Packrat middens (outlined in yellow) are collections of debris, such as plants, rocks, bones, and other artifacts, that preserve key environmental information from as far back as 45,000 years ago.
Sources/Usage
Public Domain.