Hey all! I'm new to the forum so I thought I'd introduce myself with a find! I found this one while searching for artifacts in my historical geology class.
The rock was found beside a dock located on a river right off the ocean (wilmington, nc). The location this rock was found in had several varieties of rocks including clay, siltstone, and scorria. This rock appears to be chert. It has glassy cleavage and banding along its side. It also reacts slightly with HCl. The small bore holes on the top surface come in pairs. My guess is that they were formed by Polychaeda? I am really having trouble identifying the marking on the front, however. They appear to look almost like tire tracks with several ridges along the edges is them. Can anybody help me ID this one?
Here is a view from the side.