PBDB Collection

Ridgeview: Geringian, Nebraska

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Macroscelidea - Amphilemuridae

	Ankylodon annectens Patterson and McGrew 1937	Bailey 2004
Mammalia - Chiroptera - Vespertilionidae

	Vespertilionidae indet. Gray 1821	Czaplewski et al. 1999
	a bat; ? Oligomyotis or ? Myotis sp.
	= Oligomyotis sp. Galbreath 1962	Bailey 2004
	said to be new

	"Myotis" sp. Kaup 1829	Bailey 2004
Mammalia - Rodentia - Sciuridae

	? Petauristodon sp. Engesser 1979	Bailey 2004

	Miospermophilus sp. Black 1963	Bailey 2004
	n. sp.

	Nototamias sp. Pratt and Morgan 1989	Bailey 2004
	n. sp.

	Protospermophilus sp. Gazin 1930	Bailey 2004
Mammalia - Rodentia - Aplodontidae

	cf. Prosciurus sp. (Matthew 1903)	Bailey 2004
	original and current combination Sciurus (Prosciurus)

	Meniscomys sp. Cope 1878	Bailey 2004

	Campestrallomys dawsonae (Macdonald 1963)	Bailey 2004
Mammalia - Rodentia - Allomyidae

	cf. Allomys sp. Marsh 1877	Bailey 2004

	Downsimus chadwicki Macdonald 1970	Bailey 2004
Mammalia - Rodentia - Cricetidae

	Leidymys blacki (Macdonald 1963)	Bailey 2004

	Geringia sp. Martin 1980
	= Geringia mcgregori Macdonald 1970	Bailey 2004
Mammalia - Rodentia - Florentiamyidae

	Sanctimus stuartae Macdonald 1970	Korth and Branciforte 2007

	Sanctimus cf. stouti Wahlert 1983	Korth and Branciforte 2007
	UNSM 130243

	Florentiamys sp. Wood 1936	Bailey 2004
	= Florentiamys tiptoni Macdonald 1970	Korth and Branciforte 2007
Mammalia - Rodentia - Castoridae

	cf. Agnotocastor sp. Stirton 1935	Bailey 2004
Mammalia - Rodentia - Geomyidae

	Tenudomys ridgeviewensis n. sp. Korth and Branciforte 2007	Korth and Branciforte 2007

	Tenudomys titanus Martin 1974	Korth and Branciforte 2007
Mammalia - Rodentia - Heliscomyidae

	Heliscomys woodi McGrew 1941	Tedford et al. 1996
	recombined as Tylionomys woodi

	Tylionomys voorhiesi n. sp. Korth and Branciforte 2007	Korth and Branciforte 2007

	Heliscomys sp. Cope 1873	Korth and Branciforte 2007
	UNSM 130501 - "UNSM 130501 cannot be referred to any of the other species of heliscomyid identified from the Ridgeview fauna based on the morphology of the lower premolar."

	Heliscomys cf. vetus Cope 1873	Bailey 2004
	= Heliscomys macdonaldi n. sp. Korth and Branciforte 2007	Korth and Branciforte 2007
Mammalia - Rodentia - Heteromyidae

	Proheteromys sp. Wood 1932	Bailey 2004
	= Proharrymys wahlerti n. sp. Korth and Branciforte 2007	Korth and Branciforte 2007

	Proheteromys fedti Macdonald 1963	Bailey 2004
	recombined as Proharrymys fedti

	Kirkomys schlaikjeri (Black 1961)	Bailey 2004
	recombined as Proharrymys schlaikjeri
Mammalia - Rodentia - Eomyidae

	Leptodontomys sp. Shotwell 1956
	(6 measurements)
	= Leptodontomys douglassi Burke 1934	Korth and Bailey 1992

	Metadjidaumo cf. hendryi Setoguchi 1978	Bailey 2004
Mammalia - Lagomorpha - Leporidae

	Megalagus sp. Walker 1931	Bailey 2004

	Palaeolagus hypsodus Schlaikjer 1935	Bailey 2004

	Palaeolagus philoi Dawson 1958	Bailey 2004
Mammalia - Erinaceidae

	Ocajila sp. Macdonald 1963
	= Ocajila makpiyahe Macdonald 1963	Bailey 2004
Mammalia - Talpidae

	Scalopoides sp. Wilson 1960	Tedford et al. 1996
Mammalia - Proscalopidae

	Proscalops cf. miocaenus Matthew 1901	Bailey 2004

	Oligoscalops whitmanensis Reed 1961	Bailey 2004
	synonym of Oligoscalops galbreathi
Mammalia - Soricidae

	Domnina sp. Cope 1873	Bailey 2004

	Limnoecinae indet. Repenning 1967	Bailey 2004
	n. gen. et sp.
Mammalia - Geolabididae

	Centetodon cf. magnus (Clark 1936)	Bailey 2004
Mammalia - Carnivora

	Carnivora indet. Bowdich 1821
Mammalia

	Nanodelphys sp. McGrew 1937	Bailey 2004
	n. sp.

	Marsupialia indet. (Illiger 1811)
	= Herpetotherium cf. fugax Cope 1873	Bailey 2004
see common names

Geography

Country:	United States	State/province:	Nebraska	County:	Dawes
Coordinates:	42.8° North, 103.0° West (view map)
Paleocoordinates:	43.7° North, 96.4° West
Basis of coordinate:	based on nearby landmark
Altitude:	3516 feet
Geographic resolution:	outcrop

Time

Period:	Paleogene	Epoch:	Oligocene
10 m.y. bin:	Cenozoic 4
*Period:	Tertiary
Key time interval:	Geringian
Age range of interval:	29.50000 - 24.70000 m.y. ago
* legacy (obsolete) database fields

Stratigraphy

Geological group:	Arikaree
Local section:	PineR	Local bed:	11
Local order:	bottom to top
Stratigraphic resolution:	group of beds
Stratigraphy comments: "Gering Fm." according to Swisher 1982, but "near the base of the Arikaree Group" (Bailey 1992) and "early early Arikareean" (= Geringian) (Bailey 2004)

Lithology and environment

Primary lithology:	planar lamination unlithified conglomerate
Lithology description: "1 m thick sequence of fluvial, plane-bedded sand and fine epiclastic gravel, deposited above a coarse intraclast conglomerate... plane-bedded fine gravel facies" (Bailey 2004)
Environment:	coarse channel fill
Geology comments: "attributed to flashy, upper flow regime sheet flooding in a broad, low relief, principal paleochannel" (Bailey 2004)

Taphonomy

Modes of preservation:	body
Size of fossils:	mesofossils
Articulated whole bodies:	none
Associated major elements:	none
Disassociated major elements:	many
Disassociated minor elements:	many

Collection methods and comments

Collection methods:	bulk,sieve,field collection
Minimum sieve size:	1.600
Rock censused:	682 kg
Reason for describing collection:	biostratigraphic analysis
Museum repositories:	UNSM
Collection method comments: 1000+ identifiable specimens (Bailey 1992) rock censused includes processed "gravel concentrate" and not the original sediment (Bailey 2004)
Taxonomic list comments:"amphibians, reptiles, birds" and "fish" are present but not named (Bailey (2004)

Metadata

Also known as:	UNSM Dw-121
Database number:	17709
Authorizer:	J. Alroy, J. Marcot	Enterer:	J. Alroy, J. Marcot
Modifier:	J. Alroy	Research group:	vertebrate
Created:	1995-03-26 00:00:00	Last modified:	2007-03-10 11:14:09
Access level:	the public	Released:	1995-03-26 00:00:00
Creative Commons license:	CC BY

Reference information

Primary reference:

974.

B. E. Bailey. 1992. A new early Arikareean microfauna from northwestern Nebraska. Proceedings of the Nebraska Academy of Sciences 112:65 [J. Alroy/J. Alroy/M. Uhen]

Secondary references:

6294		J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
19303		B. E. Bailey. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81-113 [J. Alroy/J. Alroy]
1297	ETE 1534	N. J. Czaplewski, B. E. Bailey, and R. G. Corner. 1999. Tertiary bats (Mammalia: Chiroptera) from northern Nebraska. Transactions of the Nebraska Academy of Sciences 25:83-93 [J. Alroy/J. Alroy/J. Alroy]
2144		W. W. Korth and B. E. Bailey. 1992. Additional Specimens of Leptodontomys douglassi (Eomyidae, Rodentia) from the Arikareean (Late Oligocene) of Nebraska. Journal of Mammalogy 73(3):651-662 [J. Alroy/J. Alroy/J. Marcot]
55528		W. W. Korth and C. Branciforte. 2007. Geomyoid rodents (Mammalia) from the Ridgeview local fauna, early-Early Arikareean (Late Oligocene) of western Nebraska. Annals of Carnegie Museum 76(3):177-201 [J. Marcot/J. Marcot]
3386		R. H. Tedford, C. C. Swisher, D. R. Prothero, S. A. King, and T. E. Tierney. 1996. The Whitneyan-Arikareean transition in the High Plains. In D. R. Prothero, R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 312-334 [J. Alroy/J. Alroy/M. Uhen]
3400		J. M. Theodor. 1999. Protoreodon walshi, a new species of agriochoerid (Oreodonta, Artiodactyla, Mammalia) from the late Uintan of San Diego County, California. Journal of Paleontology 73(6):1179-1190 [J. Alroy/J. Alroy/J. Alroy]