EMPORIA, Kan. (AP) — Two sisters have found a partially fossilized bear skull while kayaking the Arkansas River in south-central Kansas.

The Kansas Department of Wildlife and Parks said in a news release that sisters Ashley and Erin Watt made the discovery in August after flooding apparently dislodged the skull. They posted their find on Facebook, which caught the attention of a game warden.

Two Sternberg Museum of Natural History paleontologists then took a look. One of the paleontologists, Mike Everhart, says the skull was washed out of the same river sediments where Ice Age-era bison remain...