Public domain photos

The image shows a rock with a fossil of a sea slug on it, along with some text and numbers. The sea slug is a small, brownish-gray creature with a long, thin body and two antennae. Its legs are short and stubby, and its head is slightly raised. Its eyes are large and round, and it has a long tail. The text on the rock is written in a cursive font and is likely a description of the sea slug.