Mesa Redonda tracksite [general] (Triassic of the United States)

Where: Quay County, New Mexico (35.0° N, 103.6° W: paleocoordinates 9.9° N, 43.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: San Jon Creek Member (Redonda Formation), Norian (228.0 - 208.5 Ma)

• "Apachean"; 14 m below contact between Redonda Fm. and overlying Entrada Sandstone.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; massive, bioturbated, fine-grained, quartzose, gray, green, calcareous limestone and siltstone

• There are two beds of tracks in limestones that contain abundant fine-grained subangular quartz and a few oolites. A third bed contianed a track found atop a siltstone. Bed is "quartzose, fine-grained, and very calcareous. It is light olive-gray unweathered, weathers to grayish green and pale yellowish brown, and is intensively bioturbated (massive)."

Size class: macrofossils

Preservation: cast, mold/impression, trace

Collected by R. Abercrombie in 1934; reposited in the NMMNH, ROM, UMMP

Collection methods: quarrying, surface (in situ),

Primary reference: J. T. Gregory. 1972. Vertebrate faunas of the Dockum Group, Triassic, eastern New Mexico and west Texas. In V. C. Kelly & F. D. Trauger (ed.), New Mexico Geological Society, 23rd Field Conference, East Central New Mexico. New Mexico Geological Society Guidebook 23:120-123 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 52168: authorized by Matthew Carrano, entered by Kaitlin Maguire on 28.07.2005, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Mammalia
  -
Ameghinichnus sp.2
Ameghinichnus sp.2 Casamiquela 1961 mammal
Reptilia
 Squamata -
Rhynchosauroides sp.2
Rhynchosauroides sp.2 Maidwell 1911 squamates
 Pseudosuchia - Chirotheriidae
Brachychirotherium eyermani2
Brachychirotherium eyermani2 Baird 1957 archosaur
 Theropoda - Grallatoridae
Grallator sp.4, aff. Grallator sp.3, Grallator cursorius2
Grallator sp.4 Hitchcock 1858 theropod
MDM 248
aff. Grallator sp.3 Hitchcock 1858 theropod
UMMP 16161
Grallator cursorius2 Hitchcock 1858 theropod
 Saurischia -
Pseudotetrasauropus sp.1
Pseudotetrasauropus sp.1 Ellenberger 1965 prosauropod
 Saurischia - Otozoidae
Evazoum sirigui2
Evazoum sirigui2 Nicosia and Loi 2003 prosauropod
1Hunt et al. 1993; 2Hunt and Lucas 2007; 3Hunt et al. 2000; 4Lucas et al. 1986