Torrey Sandstone is a middle Eocene (48,000,000 years old) rock formation originally deposited as a sandbar. The loose sand was cemented later by calcite from water flowing through the sand. Few fossils are found in the sandstone because not many creatures live in a sand bar.

Torrey Sandstone is a middle Eocene (48,000,000 years old) rock formation originally deposited as a sandbar. The loose sand was cemented later by calcite from water flowing through the sand. Few fossils are found in the sandstone because not many creatures live in a sand bar.