Jason Spring (Paleocene of the United States)

Where: Sanpete County, Utah (39.1° N, 111.8° W: paleocoordinates 46.6° N, 90.4° W)

• coordinate based on political unit

When: North Horn Formation, Puercan (66.0 - 63.3 Ma)

Environment/lithology: terrestrial

Primary reference: S. F. Robison. 1986. Paleocene (Puercan-Torrejonian) mammalian faunas of the North Horn Formation, central Utah. Brigham Young University Geology Studies 33(1):87-133 [J. Alroy/J. Alroy]more details

PaleoDB collection 14748: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• about 180 m below upper contact of Fm.
unclassified
  -
Bivalvia
 Unionida - Unionidae
"Plesielliptio sp." = Elliptio (Plesielliptio)
"Plesielliptio sp." = Elliptio (Plesielliptio) Russell 1934 freshwater mussel
Gastropoda
 Architaenioglossa - Viviparidae
Viviparus sp. Montfort 1810 snail
 Basommatophora - Physidae
Physa sp. Draparnaud 1801 pulmonate
Actinopteri
 Lepisosteiformes - Lepisosteidae
cf. Lepisosteus sp. Agassiz 1843 gar
Reptilia
 Testudines - Trionychidae
Trionychidae indet.2 Gray 1825 softshell turtle
 Testudines -
Compsemys victa Leidy 1856 turtle
 Testudines - Kinosternoidea
Hoplochelys sp. Hay 1908 mud turtle
 Testudines - Pantrionychidae
? Plastomenus sp. Cope 1873 turtle
 Crocodylia - Alligatoridae
cf. Allognathosuchus sp. Mook 1921 crocodilian
Mammalia
 Ungulata - Periptychidae
Periptychus coarctatus1 Cope 1883 condylarth
Ectoconus sp. Cope 1884 condylarth
Ectoconus symbolus Gazin 1939 condylarth
 Insectivora -
? Insectivora indet. Bowdich 1821 insectivoran