Ralph B. Clark Interpretive Center 8420

Locality: Construction of State Routes 133, 241, 261, Santa Ana Mountians, Orange County, California.

Horizon: Holz Shale Member, Ladd Formation.

Biostratigraphy:

Age: Turonian Stage, Uppermost Gallic Subepoch, Lowermost Gulf Epoch, to Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material: Carapace, 2 cervical vertebrae, rib and bone fragments, and 2 ungual phalanges.