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Found this small tooth at Flag Ponds, MD while sifting in the surf. Does anyone have an idea as to the type of shark ? Thanks

It has a mass of what looks to be hematite but I'm not very well educated on mineral deposits in general. I do however understand and know the different parts of a skull and this has all of them. Some are misshapen do to an impact of some type on the left side just behind where the eye should be. I'm convinced that it was part of the mass that adhered to the left side because there is a center point to it and a tunnel if you will leading from that point to the lower right jaw where it is broken and pushed forward. The lines of hematite on the outside across the front of it also line up with both the center point and the break in the jaw. Just below the right eye socket is where the eyeball itself has petrified. Some of my pictures are not the best but that what I've got to work with. I'm not sure if it's some type of hominid or lizard. The general size and shape say hominid but the ridges on the back of the skull and the small holes in the right front portion of the jaw on the right side are similar to that of a lizard. Not sure what to think about that. I do understand that some of the lines look like mineral deposits but they are entirely too inconsistent to be that. I have also removed a bunch of those lines by simply scrubbing it with a brush and water. If those lines were sediment deposited the would not just wipe off. Some photos are from before and some are after I started cleaning it.

I found this on a beach at lake Michigan in southeast Wisconsin, Kenosha area. I'm just learning fossils and constantly in the searching for knowledge. Thank you for your help.

This was given to me by friend who inherited his grandfather's collection of petrified wood, crystals, and much more scattered around his yard. I'm not sure if it was originally from northern California but that is where it was when I received it. Sorry for the lack of info. I'm hoping the cross section that it has my help.

This is a vertebra that I found on a gravel bar last month on the south Brazos. It is large but has a small neural opening, and I wonder if it is from near the end of the tail. Someone have a clue? It does look like a megatherium caudal that I found in a paper, but that photo is poor.

So My missus drove me out to Arkona for one last stab at Arkona for 2017. It was cold, but I had to get out and play for one last time. This pic shows the south pit in the morning. A lot was under ice. As I was walking to an already existing bench, this was by my foot. One of many orphaned coral "pies."

Hi is this a theropod, if so what kind? I see an embryo minus the shell. The head(?) Is separate from the body except in third pic I placed it back on. The whole thing is extremely heavy and 19 inches long and approximately 11 inches wide.