Rock exhibits discoloration, algae, and shadow on fossil base.
A closeup, top-down view of a large, light brown, grained rock. It has discoloration in the bottom left corner, causing the color to change to chalk white, and the top right corner has a small patch of light beige discoloration. In the bottom right corner, the rock is damp and has dark green algae growing on it. The rock's shadow is seen on the left corner, underneath the rock, caused by the sunlight shining down onto it. It's placed on a white, light gray, with a hint of tan, coarse-grained ammonite fossil.