Pen Formation

The Pen Formation is a Campanian geologic unit in the western United States.

Sharks are well known from the Pen Formation.[1]

Other fishes include Xiphactinus,[1] the ray Ptychotrygon,[1] and

gar.[1]

Footnotes

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 "Big Bend National Park," Hunt, Santucci, and Kenworthy (2006); page 65.

References