Young locality, Delta (MWC–122.1) (Jurassic of the United States)

Also known as Wells Gulch

Where: Delta County, Colorado (38.8° N, 108.3° W: paleocoordinates 34.2° N, 54.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Salt Wash Member (Morrison Formation), Kimmeridgian (157.3 - 152.1 Ma)

• Approx. 38 m below the top of the Salt Wash Member

• bed-level stratigraphic resolution

Environment/lithology: dry floodplain; brown, red mudstone and gray sandstone

• "deposited near the distal margin of a riverine fan-like channel system", in a well-drained floodplain

Size classes: macrofossils, mesofossils

Collected by Young in 1986

Collection methods: quarrying, surface (float), surface (in situ),

Primary reference: K. F. Hirsch, R. G. Young, and H. J. Armstrong. 1987. Eggshell fragments from the Jurassic Morrison Formation of Colorado. In W. R. Averett (ed.), Paleontology and Geology of the Dinosaur Triangle: Guidebook for 1987 Field Trip. Museum of Western Colorado, Grand Junction 79-84 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 53021: authorized by Matthew Carrano, entered by Kaitlin Maguire on 31.08.2005, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Ostracoda
 Palaeocopida - Glyptopleuridae
cf. Glyptopleura sp.3 Girty 1910 ostracod
Bivalvia
 Unionida - Unionidae
Unio sp.3 Philipsson 1788 freshwater mussel
Gastropoda
 Valvatoidea - Valvatidae
Valvata sp.3 Müller 1774 snail
Reptilia
 Testudines -
Testudines indet.2 Batsch 1788 turtle
  - Prismatoolithidae
"Prismatoolithus coloradensis n. gen. n. sp." = Preprismatoolithus coloradensis1
"Prismatoolithus coloradensis n. gen. n. sp." = Preprismatoolithus coloradensis1 Hirsch 1994 dinosaur
includes eggshell
 Avetheropoda -
? Coelurosauria indet.3 coelurosaur
tooth fragments
Aves
  -
? Aves indet.3 Linnaeus 1758 bird
Reptilia
 Ornithischia - Heterodontosauridae
cf. Echinodon sp.3 Owen 1861 heterodontosaurid
tooth fragment
 Loricata -
Platyognathus sp.2 Young 1944 crocodilian
Crocodylia indet.3 crocodilian
tooth, scutes, possible egg fragments
 Eosuchia -
? Lepidosauria indet.3 lepidosaur
rib and tooth fragments
 Rhynchocephalia -
Eilenodon sp.3 Rasmussen and Callison 1981 rhynchocephalian
tooth
Mammalia
 Triconodonta -
? Triconodonta indet.3 Osborn 1888 triconodont
tooth fragments
Charophyceae
 Charales - Characeae
Pinopsida
 Pinales -
"Coniferales indet." = Pinales3
"Coniferales indet." = Pinales3 Dumortier 1829
"conifer wood"
Equisetopsida
 Equisetales - Equisetaceae
? Equisetum sp.3 Linnaeus