PBDB Collection

Lomas las Tetas de Cabra (Eocene of Mexico)

Also known as East Hill Cairn; Younger World; Too Much Hot; Mutant Hill; Lil' Buddy; Quieter Locality; Windy Gap; Manly Man; Marsupial Hill; Two Years; The H-World; Generic Locality; Danger Bird; Eeyi-Ha; The Way; Occidental Buttes; SB Hill; Slump Hill; Punta Prieta; assorted AMNH and IGM localities

Where: Baja California, Mexico (28.7° N, 114.1° W: paleocoordinates 31.1° N, 97.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Las Tetas de Cabra Formation, Wasatchian (55.8 - 50.3 Ma)

• member-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; brown, red, white sandstone and red, argillaceous siltstone

• "a fluvial, freshwater system of streams and ponds... less than 8 km inland"

• brown, red, and white sandstones and "red, clayey, thin-to-medium-bedded siltstones"

Size class: macrofossils

Collection methods: surface (float),

• "Virtually all specimens were found through prospecting and surface collecting"

Primary reference: W. J. Morris. 1966. Fossil mammals from Baja California: new evidence on early Tertiary migrations. Science 153:1376-1378 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 15671: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• treated as a unit fauna because several important specimens are from unknown localities; most localities are from a single square kilometer

•entire sequence falls within a reversely magnetized zone, presumed to be either 23R or 24n.1.r/2r; if so, no more than 0.63 m.y. are represented; however, there is nothing to rule out 24R, which spans 2.73 m.y. (see Cande & Kent 1992)"Eotitanops cf. princeps" could be from a higher level than the rest of the fauna, based on preservation and uncertain provenance; assigned to E. borealis by Gunnell and Yarborough 2000

Show authors, comments, and common names

unclassified
-	Heliantheae indet.⁶ Heliantheae indet.⁶ pollen
Angiospermae
Caryophyllales - Chenopodiaceae	Chenopodiaceae indet.⁶ Chenopodiaceae indet.⁶ Ventenant 1799 seeds
Rosales - Ulmaceae	Ulmaceae indet.⁶, Celtis sp.⁶ Ulmaceae indet.⁶ Brisseau-Mirbel 1815 elm seeds Celtis sp.⁶ Linnaeus 1753 hackberry seeds
Reptilia
Squamata -	cf. Saniwa sp.⁶ cf. Saniwa sp.⁶ Leidy 1870 squamates
Squamata - Iguanidae	Iguanidae indet.⁶ Iguanidae indet.⁶ Oppel 1811 squamates
Squamata - Boidae	Boidae indet.⁶ Boidae indet.⁶ Gray 1825 boa
Mammalia
Cimolesta - Pantolambdidae	"Barylambda jackwilsoni" = Caenolambda jepseni³ "Barylambda jackwilsoni" = Caenolambda jepseni³ Simons 1960 pantodont said to be a new genus
Cimolesta - Esthonychidae	cf. Esthonyx sp. cf. Esthonyx sp. Cope 1874 tillodont sensu stricto according to Novacek et al.
Condylarthra - Hyopsodontidae	cf. Hyopsodus sp.⁶ cf. Hyopsodus sp.⁶ Leidy 1870 condylarth
Placentalia -	Ferae indet.⁵ Ferae indet.⁵ placental
Creodonta - Oxyaenidae	cf. Oxyaena sp.⁶ cf. Oxyaena sp.⁶ Cope 1874 creodont authors acknowledge this could be Dipsalidictis
Creodonta -	Prolimnocyon sp.⁶ Prolimnocyon sp.⁶ Matthew and Granger 1915 creodont
Tribosphenida - Phenacodontidae	Phenacodus vortmani⁶, Meniscotherium chamense³, Ectocion ignotum n. sp.⁵ Phenacodus vortmani⁶ Cope 1880 condylarth Meniscotherium chamense³ Cope 1874 condylarth Ectocion ignotum n. sp.⁵ Novacek et al. 1991 condylarth said to be new
Perissodactyla - Equidae	"Eohippus cf. angustidens" = Eohippus angustidens², "Hyracotherium seekinsi n. sp." = Eohippus angustidens⁴ "Eohippus cf. angustidens" = Eohippus angustidens² Cope 1875 horse "Hyracotherium seekinsi n. sp." = Eohippus angustidens⁴ Cope 1875 horse ref 6294: seekinsi; ref 53105: Eohippus cf. angustidens
Artiodactyla - Diacodexeidae	Diacodexis cf. gracilis⁵ Diacodexis cf. gracilis⁵ Krishtalka and Stucky 1985 even-toed ungulate
Acreodi - Mesonychidae	Dissacus sp.¹ Dissacus sp.¹ Cope 1881 condylarth
Acreodi -	Wyolestes iglesius n. sp.⁵ Wyolestes iglesius n. sp.⁵ Novacek et al. 1991 mesonychian said to be new
Rodentia - Paramyidae	? Paramyidae indet.⁶ ? Paramyidae indet.⁶ Miller and Gidley 1918 rodent
Polydolopimorphia - Glasbiidae	Esteslestes ensis n. sp.⁵ Esteslestes ensis n. sp.⁵ Novacek et al. 1991 metatherian said to be a new genus
Amphibia
Caudata -	Caudata indet.⁶ Caudata indet.⁶ salamander "genus, new?"
Chondrichthyes
Carcharhiniformes - Triakidae	cf. Galeorhinus sp.⁶ cf. Galeorhinus sp.⁶ de Blainville and Prévost 1816 school shark
Gastropoda
-	Gastropoda indet.⁶ Gastropoda indet.⁶ Cuvier 1795 snail "planispiral"

¹Alroy 2002; ²Froehlich 2002; ³Lucas 1998; ⁴Morris 1968; ⁵Novacek et al. 1991; ⁶Novacek et al. 1987