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

Antiquatonia portlockiana
Antiquatonia portlockiana original illustration.

Specimens from Armstrong County

Brachiopods have been a less-than-common find at the Pine Creek locality. Gastropods, Cephalopods, and Rugose Corals are most common. Larger brachiopods are even more difficult to find. However, when they do show up, there is typically exceptional shell preservation. The two specimens below are above average in preservation. In the Brush Creek limestone, typically 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. The other is worn away.
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