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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.