 The palynomorph "Froelichsporites traversei" has been identified in the Gettysburg Formation.Relative age dating of the Gettysburg Formation places it in the Late Triassic period.In 1977, B. Cornet dated a basalt flow near Aspers, Pennsylvania and led to his conclusion that the Gettysburg is of late Carnian and Norian to Early Jurassic age.