Long Fall Horizon (Cretaceous of Canada)

Also known as Medicine Hat Brick and Tile Quarry (MHBT Quarry), in part

Where: Saskatchewan, Canada (49.5° N, 109.2° W: paleocoordinates 56.6° N, 81.6° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Frenchman Formation, Lancian (70.6 - 66.0 Ma)

• Thought to be reworked by some, but fresh exposures confirm separation of upper and lower horizons

•Might be Frenchman Formation, instead of Ravenscrag (Redman et al. 2015)

• bed-level stratigraphic resolution

Environment/lithology: fluvial; claystone and ferruginous conglomerate

• "fossiliferous clay/ironstone conglomerate"

Size class: mesofossils

Collected by R. Fox

Collection methods: bulk, quarrying, sieve,

Primary reference: R. C. Fox. 1989. The Wounded Knee local fauna and mammalian evolution near the Cretaceous-Tertiary boundary, Saskatchewan, Canada. Palaeontographica Abteilung A 208(1-3):11-59 [J. Alroy/J. Alroy/M. Carrano]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 14584: authorized by John Alroy, entered by John Alroy on 12.04.1997, edited by Patricia Holroyd and Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

• directly underlies Rav W-1 Horizon (Puercan)
Fox argues that the fauna is Cretaceous, and much of it seems to be, but insofar as it is deposited at the base of a strongly crossbedded sandstone, I believe it is mixed in the same way as the Montana localities described by Lofgren 1995; I have used Lofgren's scheme for sorting out Cretaceous and Paleocene lists
Mesodma thompsoni could be either Cretaceous or Paleocene and therefore is not placed
supersedes Johnston and Fox 1984 and Fox 1990. BUT Fox 1997 claims there is no reworking, and that the horizons are legitimately distinct, and that there are Cretaceous "condylarths" elsewhere in SK.
Reptilia
 Testudines - Macrobaenidae
"Judithemys russelli n. sp." = Osteopygis russelli1
"Judithemys russelli n. sp." = Osteopygis russelli1 Brinkman 2015 turtle
UALVP 47598, articulated shell and pelvis. Carapace missing left peripherals six to nine and right peripherals five to seven. Plastron missing epiplastra and entoplastron. Pelvis visible in left lateral view.
Mammalia
 Theriamorpha - Gypsonictopidae
Gypsonictops illuminatus Lillegraven 1969 eutherian
 Cimolesta - Cimolestidae
"Cimolestes cf. cerberoides" = Ambilestes cerberoides, Cimolestes cf. stirtoni
"Cimolestes cf. cerberoides" = Ambilestes cerberoides Lillegraven 1969 eutherian
Cimolestes cf. stirtoni Clemens 1973 eutherian
 Theriamorpha - Herpetotheriidae
"Alphadon jasoni" = Nortedelphys jasoni3
"Alphadon jasoni" = Nortedelphys jasoni3 Storer 1991 marsupial
 Theriamorpha - Pediomyidae
Pediomys elegans Marsh 1889 metatherian
 Multituberculata - Cimolodontidae
Cimolodon nitidus Marsh 1889 multituberculate
 Multituberculata - Cimolomyidae
Meniscoessus cf. robustus Marsh 1889 multituberculate
Cimolomys cf. gracilis Marsh 1889 multituberculate
Amphibia
 Caudata - Urodela
Urodela indet.2 salamander