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I found hundreds of these in San Antonio and would like to have a few interesting facts for my 5 year old students. My best guess from pictures online was they are exogyra? And they are from the Cretaceous period? I also do not want to give them the wrong information. Can anyone help? The pictures I am sending are all of just one fossil.

Hi Everyone. I was fortunate to be able to take a weeklong vacation trip the week of Labor Day, my fourth since I began collecting fossils. I wanted to visit friends and family and do some collecting. I was able to do all of that. It was busy, but there was also some quality relaxation time. It proved to be a good break. I flew into the Denver airport, rented a car and drove to Colorado Springs where I was invited to stay with my second cousin and her family. Next morning I was on my way to Florissant Fossil Quarry. I've known about Florissant for over 50 years and over 40 years ago I visited the National Monument, back when I was interested in fossils, but not into collecting them. This time I was intent on collecting and spent four hours splitting shale at the pay to collect quarry. The famous Florissant site was a lake during the late Eocene age. A number of eruptions from a nearby volcano buried animals and plants in beds of shale that were in turn covered by volcanic ash which beautifully preserved their exquisite details. These photographs show the exposure that's quarried, the area where guests like me can split the shale, and my finds from four hours of splitting.