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Last week while visiting Waco, Texas, I took four of my grandchildren to the Waco Research Pit. After getting a permit, we spent about three hours there and among the more fascinating fossils we found were oysters (possibly of the genus Texigryphaea). Of special interest were the epibionts, some of which seem to be parasitic. There were at least two sizes of tube worms, and bryozoans. The second picture below is not of epibionts on an oyster, but rather a one-inch wide piece I found separately in the same area. If I understand correctly, the Waco Pit is in the Del Rio Clay Formation, Cenomanian Stage, Cretaceous. It was a nice trip and a great place to take children. Russ
Piedras_de_Tejas posted a topic in Fossil IDDoes anyone know of a specific name for flint or chert nodules containing quartz-replaced fossils? Also, do these form in a particular formation or did they develop in several in the presence of dissolved quartz? i have found these in many areas around san antonio and they're my favorite to encounter. The first pic resembles tube worms to me and i have no clue what the fossils are in the second two images, but the one that appears as dozens of adjacent, long, parallel columns comes up often in my area.