Dug Up Pattern Glass

The photos are horrid as this was an after-thought (as in, after I put my photo board away).

I've had it a few years, having pulled it out of a hill near Christmastime (no snow that year till after Christmas) along the bank of what was once a hotel/resort and later private residence, then Boy Scout Camp, and finally a park.

I ground and sanded off the edges (safety) and use it to give water to my lizard.

Just curious on its age and pattern name?