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.
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.
- 1855, Norwood, J.G., Pratten, H., Notice of fossils from the Carboniferous Series of the western states belonging to the genera Spirifer, Bellerophon, Pleurotomaria, Macrocheilus, Natica, and Loxonema, with descriptions of eight new characteristic species. Journal of the Academy of Natural Sciences of Philadelphia 3: pp. 71-77
- 1976, Brew, D.C., Beus, S.S., A Middle Pennsylvanian fauna from the Naco Formation near Kohl Ranch, Central Arizona. Journal of Paleontology 50, pp. 888-906