Also known as Superduck, Probrachylophosaurus-type locality

Where: Montana (49.0° N, 110.5° W: paleocoordinates 56.2° N, 76.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Judith River Formation (Montana Group), Middle Campanian to Middle Campanian (83.5 - 70.6 Ma)

• The site, MOR locality JR-518 (“Superduck”), is within a grey mudstone stratigraphically equivalent to Unit 1 of the Oldman Formation of Alberta. The bone horizon is 17.5 m above the top of the Marker A Coal of the Taber Coal Zone of the Foremost Formation, and 7.0 m above the top of the Herronton Sandstone Zone of the Foremost Formation (Fig 4), with a recalibrated age between 79.5 +/- 0.2 Ma and 79.8 +/- 0.2 Ma [10, 11].

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithified, gray mudstone

Size class: macrofossils

Primary reference: E. A. Freedman Fowler and J. R. Horner. 2015. A new brachylophosaurin hadrosaur (Dinosauria: Ornithischia) with an intermediate nasal crest from the Campanian Judith River Formation of northcentral Montana. PLoS One 10(11):e0141304 [G. Lloyd/G. Lloyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 194654: authorized by Graeme Lloyd, entered by Graeme Lloyd on 24.06.2018

Creative Commons license: CC BY (attribution)