I was looking for seashells knee deep in the ocean, and picked up what I first thought was a really cool oddly shaped piece of driftwood, although it was lying on the floor, rather than floating. Later when I took my finds out of the bucket, I looked closer at it, and it seems to be a very old tooth. I think it may have even been fossilized, as it is like bone, but brown in color like mineral deposits. Also, it has an odd surface, almost like an iridescent webbing or veins on the outer surface, and inside, hollow symmetrical on both sides cavities. I don't think it is a shark tooth, after looking online, it seems like it could be a dinosaur tooth or vertebrae. It's driving me nuts. I want to know what it is and if its valuable. Thanks!
I'm no expert, but it doesn't look like a dinosaur tooth. You don't say in which ocean you found it. If on some British beach, bring it to the Museum and our palaeontologists will try to ID it for you.
fossil fish skull cap/fragment?
I agree with lullabee, the third photo down shows the most obvious features. There is right left symmetry and there are two 'sunburst' like plates of bone one either side, this is typical of the top surface of a fish skull.