Yorktown Formation at Rushmere
![A researchers stands next to a Yorktown formation at Rushmere](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/IMG_5596_0.jpg?itok=FgiGaQf5)
Detailed Description
The Pliocene Yorktown Formation was deposited about 3 million years ago when sea level was much higher. Chesapectin jeffersonius, the Virginia state fossil, is found in these marine sediments.
Sources/Usage
Public Domain.