Mason Pocket (Paleocene of the United States)

Also known as Tiffany (in part)

Where: La Plata County, Colorado (37.1° N, 107.6° W: paleocoordinates 43.0° N, 89.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Tiffanian (61.7 - 56.8 Ma)

• bed-level stratigraphic resolution

Environment/lithology: fissure fill; fine-grained, shelly/skeletal, gray shale

• "it might be a fissure filling"
• "dark gray shale very fine in texture... full of bones and fragments" (Matthew 1917)

Size class: macrofossils

Collected by W. Granger in 1916; reposited in the AMNH

Primary reference: G. G. Simpson. 1935. The Tiffany fauna, Upper Paleocene. 1, Multituberculata, Marsupialia, Insectivora, and ?Chiroptera. American Museum Novitates 795 [J. Alroy/J. Alroy/J. Ju]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 14967: authorized by John Alroy, entered by John Alroy on 27.09.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• fauna known only from 1916 Granger collection
sec 20 T 33 N R 6 W
"Most other localities in the vicinity of Tiffany are stratigraphically higher than Mason Pocket": Butler et al. 1981
the "Bayfield" or "Tiffany" fauna includes many localities other than Mason Pocket such as Carracas Station and Crowbar Creek (see); additional records based on Simpson and other sources include the following: Chriacus sp., named Chriacus metocometi by Van Valen 1978 ? Dissacus sp. Phenacodus grangeri type Phenacodus matthewi type (includes type of "P. gidleyi"; see Thewissen 1990) additional Phenacodus sp. Phenacodus magnus Thewissen 1990: collected after Simpson 1935 Periptychus "superstes" type Aletodon ("Platymastus") mellon of Van Valen 1978 from 50 m above quarry: Gingerich 1983c Oxyaena sp. Gingerich 1980a from "near Tiffany"; probably the same as O. sp. from "just north of Mason Pocket" of Van Valen 1966 "Ignatiolambda barnesi" type Simons 1960: "presumed basal part of Tiffany formation, east of the Florida River and west of the Ignacio, north of the Mesa Mountains, SW 1/4, Sec. 29, R 8 W, T 34 N, La Plata County"
 Strigiformes - Ogygoptyngidae
Ogygoptynx wetmorei n. gen. n. sp.5
Ogygoptynx wetmorei n. gen. n. sp.5 Rich and Bohaska 1976 owl
 Primates - Microsyopidae
Navajovius kohlhaasae n. sp. Matthew and Granger 1921 primate
 Primates - Plesiadapidae
Chiromyoides caesor2 Gingerich 1973 primate
new UCMP specimen
Nannodectes gidleyi1 Matthew 1917 primate
 Primates - Picrodontidae
Zanycteris paleocenus n. gen. n. sp.
Zanycteris paleocenus n. gen. n. sp. Matthew 1917 primate
 Primates - Carpolestidae
Carpodaptes aulacodon n. sp. Matthew and Granger 1921 primate
 Primates - Paromomyidae
Ignacius frugivorus1 Matthew and Granger 1921 primate
 Tribosphenida - Nyctitheriidae
Leptacodon tener n. sp. Matthew and Granger 1921 placental
 Tribosphenida -
Xenacodon mutilatus n. sp. Matthew and Granger 1921 placental
 Macroscelidea - Apheliscidae
Utemylus latomius n. sp.3 Gingerich 1983 elephant shrew
collected in 1940
 Tribosphenida - Arctocyonidae
Thryptacodon australis n. sp. Simpson 1935 condylarth
 Insectivora - Apatemyidae
Labidolemur soricoides n. sp. Matthew and Granger 1921 insectivoran
 Theriiformes - Peradectidae
Peradectes elegans n. sp. Matthew and Granger 1921 metatherian
 Multituberculata - Neoplagiaulacidae
Ectypodus musculus n. sp. Matthew and Granger 1921 multituberculate
 Multituberculata - Ptilodontidae
Ptilodus kummae4 Krause 1977 multituberculate
"Mason Pocket"