formation | Command (military formation) | Elliot Formation | Colton | Lance Formation | Crato Formation | Chinle Formation | Two Medicine Formation | Tamayama Formation | Missing Man Formation (band) | Missing Man Formation | Marcellus Formation | Kirkwood Formation | Gettysburg Formation | Colton Ford | Colton, California | Clarens Formation | Whitby Mudstone Formation | Walter Colton | Tunbridge Wells Sand Formation | Santana Formation | Phalanx formation | phalanx formation | Mahantango Formation | Leduc Formation | Identity formation | Hanson Formation | Formation (stratigraphy) | formation (stratigraphy) | Formation |
recurvirostris is a disputed species possibly synonymous with P. pervetus; it is known from a partial wing (KUVP 10105) found in Colton Formation Eocene sediments of the Wasatch Plateau near Ephraim, Utah.