Norwood and Pratten first described Antiquatonia portlockiana in 1855 as Producti portlockianus. In 1976, the species was rearranged as Antiquatonia portlockiana by Douglas C. Brew and Stanley S. Beus.

Antiquatonia portlockiana
Antiquatonia portlockiana original illustration.

Specimens of Antiquatonia Portlockiana from Armstrong County

Brachiopods have been a less-than-common find at the Pine Creek locality. Gastropods, Cephalopods, and Rugose Corals are the most common. Larger brachiopods are even more challenging to find. However, there is typically exceptional shell preservation when they do show up. The two specimens below are above average in preservation. In the Brush Creek limestone, normally, you lose an outer shell layer, and the ears break off.

Antiquatonia portlockiana, CG-0223
CG-0223, Antiquatonia portlockiana, Glenshaw Formation, Pine Creek limestone, Armstrong County, Pennsylvania, United States
Antiquatonia portlockiana, CG-0223
CG-0223, Antiquatonia portlockiana, Glenshaw Formation, Pine Creek limestone, Armstrong County, Pennsylvania, United States
Antiquatonia portlockiana, CG-0224
CG-0224, Antiquatonia portlockiana, Glenshaw Formation, Pine Creek limestone, Armstrong County, Pennsylvania, United States. A large specimen, one preserved ear.
Antiquatonia portlockiana, CG-0224
CG-0224, Antiquatonia portlockiana, Glenshaw Formation, Pine Creek limestone, Armstrong County, Pennsylvania, United States. The bottom matrix was left in place to ensure the shell did not break from removal.

References