Squires, R.L. (1989) First Tertiary occurrence of a rare patelliform gastropod (Archaeogastropoda: Symmetrocapulidae), Eocene Tejon Formation, Tehachapi Mountains, California. Veliger32(4): 406-408. PDF is 6.2MB
First Tertiary occurrence of a rare patelliform gastropod (Archaeogastropoda: Symmetrocapulidae), Eocene Tejon Formation, Tehachapi Mountains, California