A fossil site at a borrow pit in near Cheswold, Delaware created during highway construction unearthed 11 specimens of fragmentary and unassociated avian fossils, which were identified by Rasmussen as including a small loon, a small gull-like species and five specimens of a gannet-like seabird, probably "Morus loxostylus", a common species in the Miocene. All of these forms were already known from a site in Chesapeake Bay, Maryland. The finds suggests that the Delaware site was the near-shore area of a large bay at the time of deposition.