Dickinson Member (Woodland) (Oligocene of the United States)

Also known as Obritsch Ranch; Fitterer Ranch; Fitterer Bed Quarry

Where: Stark County, North Dakota (46.9° N, 102.8° W: paleocoordinates 48.0° N, 94.2° W)

• coordinate based on political unit

When: Brule Formation, Orellan (33.9 - 33.3 Ma)

• member-level stratigraphic resolution

Environment/lithology: terrestrial

Primary reference: J. W. Hoganson and G. E. Lammers. 1992. Vertebrate fossil record, age, and paleoenvironmental setting of the Brule Formation (Oligocene) in North Dakota. Proceedings of the F. D. Holland, Jr., Geological Symposium 243-255 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 17101: authorized by John Alroy, entered by John Alroy on 27.09.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• "channel sandstone facies"
said to overlie the "White marker" = "Greenish band" of Douglass 1909 by Stevens and Stevens 1996
Fitterer Ranch channel sandstone is in a reversed polarity interval: Prothero 1996c
Fitterer Ranch is in SE 1/4 sec 7 T137N R97W, i.e., at least 5 mi NNW of Little Badlands, 13 mi. S and 8 mi. W of Dickinson
Mammalia
 Rodentia - Castoridae
Agnotocastor praetereadens Stirton 1935 beaver
Oligotheriomys primus n. sp.2 Korth 1998 beaver
from "Brule... Fitterer Ranch, sec. 17, T137N, R97W"
 Rodentia - Ischyromyidae
Ischyromys typus Leidy 1856 rodent
 Lagomorpha - Leporidae
Palaeolagus haydeni Leidy 1856 rabbit
 Perissodactyla - Amynodontidae
Metamynodon sp. Scott and Osborn 1887 odd-toed ungulate
 Perissodactyla - Rhinocerotidae
Subhyracodon occidentalis Leidy 1850 rhinoceros
 Perissodactyla - Equidae
Mesohippus bairdi Leidy 1850 anchitheriine horse
 Tribosphenida - Proscalopidae
Oligoscalops galbreathi3 Reed 1956 placental
 Tribosphenida - Apternodontidae
Oligoryctes altitalonidus1 Clark 1936 placental
"lower part of the Brule Formation at Fitterer Ranch... channel deposit... late Orellan"
 Carnivora - Canidae
Hesperocyon gregarius6 Cope 1873 canid
10, 15, and 20 ft above base of channel; 50 ft above base of banded zone; Fitterer Channel; base of nodular zone; above nodular zone; and level 2B of Skinner 1951
Osbornodon renjiei n. sp.6 Wang 1994 canid
Fitterer Channel on Leo Fitterer Ranch; this is unit 5 of Skinner 1951, and some material is from 15 ft above base of channel
 Ungulata - Merycoidodontidae
Merycoidodon sp.5, "Merycoidodon bullatus" = Merycoidodon (Otarohyus) bullatus4, "Merycoidodon major" = Merycoidodon (Otarohyus) major5
Merycoidodon sp.5 Leidy 1848 oreodont
"Merycoidodon bullatus" = Merycoidodon (Otarohyus) bullatus4 Leidy 1869 oreodont
"Merycoidodon major" = Merycoidodon (Otarohyus) major5 Leidy 1853 oreodont
 Ungulata - Entelodontidae
Archaeotherium mortoni Leidy 1850 even-toed ungulate
may include specimen of Peterson 1909 from "Oreodon beds near Dickinson in the Little Bad-lands"
 Ungulata - Anthracotheriidae
Bothriodon sp. Aymard 1846 anthracothere