View attachment 1617300View attachment 1617301View attachment 1617302View attachment 1617299A couple of years ago I found a new subdivision going in. They had to excavate large runoff ponds, and they cut through an old undisturbed clay layer estimated age 20-30 million years old. It was loaded with shark teeth, and whale fossils, as well as other sea creature fossil. They spread this clay over the entire site, and I spent several months collecting shark teeth and fossils there. They were not creek tumbled finds, but had lain undisturbed and buried since they settled to the bottom of what used to be the shallow sea covering the east coast lowcountry. Anyway, I discovered at home one day, that they glowed under UV light. I bought a 100 LED UV flashlight, and hunted the site at night. The teeth glowed a bright yellow/green, and stood out like beacons in the dark. I never tested them with a Geiger counter, but I suspect the glow is from uranium, absorbed over millions of years.
Didn't intend to step on your thread, but most of these were found with a UV light.