Where: Pennington County, South Dakota (43.9° N, 102.6° W: paleocoordinates 50.1° N, 76.4° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Baculites grandis ammonoid zone, Pierre Formation, Maastrichtian (72.1 - 66.0 Ma)
• concretions found "about thirty feet above the undoubted base of the White River beds" thought to be reworked from the "Ft. Pierre" (= Pierre Shale; Campanian or Maastrichtian based on ammonites). PJW: Baculites grandis zone is Maastrichtian;
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified, concretionary siliciclastic sediments
Size class: macrofossils
Collected in 1903
• Amherst College collection
Primary reference: F. B. Loomis. 1904. Two new river reptiles from the Titanothere beds. American Journal of Science 18:427-432 [J. Alroy/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 99710: authorized by John Alroy, entered by John Alroy on 19.11.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Baculites ovatus Say 1820 ammonite
Baculites grandis Hall and Meek 1854 ammonite | |
Reptilia | |
|