Purgatoire River tracksite, Unit B2 (Jurassic to of the United States)

Also known as Picketwire

Where: Otero County, Colorado (37.5° N, 103.7° W: paleocoordinates 32.8° N, 51.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Unit B Member (Morrison Formation), Kimmeridgian to Kimmeridgian (157.3 - 145.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: coastal; ooidal, shelly/skeletal, sandy lime mudstone

• Tracks are at the top of the shoreline facies beds.
• "imbricate lithoclasts at the base with minor quartz grains, ooids and transported biota including chara, ostracods, fish debris and transported unionid shells in a sparry micritic matrix, and fine upward to micrites with ripple marks and mudcracks, representing higher energy shoreline conditions indicative of flood/storm events."

Size class: macrofossils

Preservation: mold/impression, trace

Collected by Bird, Lockley in 1935, 1938, 1985

• site discovered by Ridennoure and R. Owens

Primary reference: J. S. MacClary. 1938. Dinosaur trails of Purgatory. Scientific American 158(1):72 [M. Carrano/M. Carrano]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 52919: authorized by Matthew Carrano, entered by Kaitlin Maguire on 26.08.2005, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
 Charales - Characea
Chara sp.5
Chara sp.5 Linnaeus 1753 stonewort
Actinopteri
 Holostei -
Holostei indet.3
Holostei indet.3 Müller 1846
Reptilia
 Theropoda -
Theropoda indet.4
 Saurischia - Parabrontopodidae
Parabrontopodus mcintoshi n. gen. n. sp.1
Parabrontopodus mcintoshi n. gen. n. sp.1 Lockley et al. 1995 sauropod
 Ornithischia - Camptosauridae
Camptosauridae indet.4
Camptosauridae indet.4 Marsh 1885 camptosaurid
Bivalvia
 Unionida - Unionidae
Unionidae indet.3
Unionidae indet.3 Rafinesque 1820 freshwater mussel
Branchiopoda
 Diplostraca -
Conchostraca indet.2
Conchostraca indet.2 Sars 1867 clam shrimp
Deuteropoda
  -
Ostracoda indet.4
Ostracoda indet.4 Latreille 1802 ostracod
1Lockley et al. 1995; 2Lockley et al. 1986; 3Lockley et al. 1984; 4Prince 1983; 5Prince and Lockley 1989