So this is at Texas Tarrant County near a large pond. Not sure if the tooth is crocodile, fish, marine dinosaur or small mammel. The rock with circles on it I'm guessing is an imprint of a shell. And the other one I think is bone in Rock not sure if it's like a tooth if so I guess bovine or triceratops but I'm not sure if it's a recent bone or a bone from the dinosaur era (or if it's a bone at all). Also a general question of how do you know if something is a modern bone or dinosaur bone, I found some level surface and you can see the face of the bone, the rest is in the ground and it's near a pond. If anyone has answers to these questions that will be great. Excuse my lack of knowledge in these areas I'm new and I've just started with no current knowledge in dinosaurs.