Holbrook quarry, UCMP V3922 (Triassic to of the United States)

Also known as Geronimo Quarry

Where: Navajo County, Arizona (34.9° N, 110.3° W: paleocoordinates 3.2° N, 38.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Holbrook Member (Moenkopi Formation), Aegean to Aegean (247.2 - 242.0 Ma)

• "In the Holbrook Member beneath the 'upper massive sandstone' that caps the Holbrook Member"

•Lucas & Schoch (2002: Lethaia 35: 97-106) inferred the Holbrook member to be earliest Anisian (Aegean–Bithynian) in age based upon tetrapod biostratigraphy (Eocyclotosaurus used to correlate Holbrook Member to German Upper Bundsandstein) and magnetostratigraphy

• bed-level stratigraphic resolution

Environment/lithology: fine channel fill; concretionary, nodular, green, red, sandy siltstone

• "Channel deposit of greenish, limy silt and sand with included lumps of chocolate shale and small greenish lime nodules with gray centres. Bone as waterworn fragments in matrix"

Size classes: macrofossils, mesofossils

Preservation: charcoalification

Collected by S. Welles in 1939, 1940; reposited in the UCMP

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

Primary reference: S. P. Welles. 1947. Vertebrates from the Upper Moenkopi Formation of northern Arizona. University of California Publications in Geological Sciences 27(7):241-294 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 34888: authorized by John Alroy, entered by Erin Leckey on 09.10.2003, edited by Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

 Hybodontiformes - Hybodontidae
"Leiacanthus sp." = Hybodus
"Leiacanthus sp." = Hybodus Agassiz 1837 elasmobranch
 Ptycholepiformes - Ptycholepididae
? Boreosomus sp. Stensiö 1921
ganoid scales
 Coelacanthiformes - Coelacanthidae
Moenkopia wellesi n. gen. n. sp.3
Moenkopia wellesi n. gen. n. sp.3 Schaeffer and Gregory 1961 coelacanth
UCMP 36193, complete basisphenoid (holotype). UCMP 37801, 36234, 36197, basisphenoids. UCMP 56228, parasphenoid. UCMP 37788, 37789, 37790, 37793, pterygoids. UCMP 37791, quadrate. UCMP 56078, ceratohyal. UCMP 73805, 73806, cleithra.
 Temnospondyli -
"Taphrognathus bradyi n. gen. n. sp." = Hadrokkosaurus bradyi
"Taphrognathus bradyi n. gen. n. sp." = Hadrokkosaurus bradyi Welles 1947 tetrapod
UCMP 36199 (holotype), mandibular ramus
 Temnospondyli - Brachyopidae
Vigilius wellesi5 Warren and Marsicano 2000 tetrapod
UCMP 36205, 36247, 36836, 37771, 75431, 75432, 75433, 75435, 76477, 76478, 76479, isolated skull fragments; UCMP 36205, mandible; UCMP 80855, atlas; UCMP 36841, clavicle; UCMP 37770, humerus
 Temnospondyli - Heylerosauridae
Rhadalognathus boweni n. gen. n. sp.
Rhadalognathus boweni n. gen. n. sp. Welles 1947 tetrapod
UCMP 36221, anterior half of left mandibular ramus. Numerous other fragments
 Temnospondyli -
"Cyclotosaurus randalli n. sp." = Eocyclotosaurus randalli, Eocyclotosaurus wellesi n. sp.4
"Cyclotosaurus randalli n. sp." = Eocyclotosaurus randalli Welles 1947 tetrapod
UCMP 36188 (holotype), skull roof. UCMP 36189, 36190, partial skulls. Numerous additional skull, jaw and skeletal elements
Eocyclotosaurus wellesi n. sp.4 Schoch 2000 tetrapod
UCMP 42841 (holotype), skull. UCMP 36220, postglenoid area
Reptilia indet. Laurenti 1768 reptile
At least 50 elements, some of which may belong to Arizonasaurus and/or Anisodontosaurus.
 Archosauria -
Archosauria indet.1 Cope 1869 archosaur
UCMP 36231, partial maxilla
 Pseudosuchia -
Poposauroidea "unnamed species"2 Nopcsa 1923 archosaur
"Chatterjeea-like taxon"
 Pseudosuchia - Ctenosauriscidae
Arizonasaurus babbitti n. gen. n. sp.
Arizonasaurus babbitti n. gen. n. sp. Welles 1947 archosaur
UCMP 36232, anterior of left maxilla. UCMP 36233, 37815, ilia, UCMP 37812, 37818, vertebrae, UCMP 37803, femur
 Pseudosuchia - Chirotheriidae
Chirotherium sp. Kaup 1835 archosaur
 Eosuchia -
Anisodontosaurus greeri n. gen. n. sp.
Anisodontosaurus greeri n. gen. n. sp. Welles 1947 crown diapsid
UCMP 37804, left mandible with teeth
Plantae indet. Haeckel 1866
carbonized remains
  - Calamitaceae
Calamites sp. Brongniart 1828