I think the red-ear slider is probably the one I call the common water turtle. I think it looked right for that except I've never seen one so large and I don't see them so far away from a body of water. That wouldn't be usual for nesting, would it? Its head wasn't out far enough to show the 'red ear' pattern when I took the photo and I can't remember now. It's been too long. The nest wasn't a success. Armadillos (it looked like their damage) found it soon after, but I guess it could also have been a skunk or raccoon or maybe a possum. Too bad. It would have been fun to see them hatch out.