North Quarry/Camp Quarry, Proctor Lake Dinosaur Locality (SMU 001): Late/Upper Aptian, Texas
collected by D. Winkler 1985

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
aff. Hypsilophodon sp. Huxley 1870
32 individuals
SMU 70444, 70445, 70456, 70534, etc. (488 total specimens)
    = Euornithopoda indet. Sereno 1986
Norman et al. 2004
New unnamed taxon more derived than Hypsilophodon
    = Convolosaurus marri n. gen., n. sp. Andrzejewski et al. 2019
Andrzejewski et al. 2019
Reptilia - Dromaeosauridae
Theropoda indet. Marsh 1881
1 individual
tooth, SMU 70435
    = cf. Dromaeosauridae indet. Colbert and Russell 1969
Winkler et al. 1990
    = Dromaeosaurinae indet. Matthew and Brown 1922
Adams and Andrzejewski 2019
Reptilia - Paralligatoridae
Tarsomordeo winkleri n. gen., n. sp. Adams 2019
Adams 2019 1 individual
SMU 76870 - holotype (partial skeleton)
Crocodylia indet. (Owen 1842)
24 individuals
    = Wannchampsus kirpachi n. gen., n. sp. Adams 2014
Adams 2014
SMU 76604 - holotype (partial skull & mandible); SMU 76605 - paratype (partial skull & mandible); SMU 76818, L dentary; SMU 76835, teeth; SMU 71486-71487, SMU 74550, SMU 76819–SMU 76821, vertebrae; SMU 76822-76823, SMU 71488, R coracoids; SMU 76824-76825, R humeri, SMU 76826, L humerus; SMU 76828, L ulna; SMU 76827, R radius; SMU 76829, R ulnare; SMU 76830, R radiale; SMU 76831-76833, carpals; SMU 76834, osteoderm
see common names

Geography
Country:United States State/province:Texas County:Comanche
Coordinates: 32.0° North, 98.5° West (view map)
Paleocoordinates:30.1° North, 53.3° West
Basis of coordinate:based on nearby landmark
Altitude:1162 feet
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Stage:Aptian 10 m.y. bin:Cretaceous 3
*Period:Jurassic
*International age/stage:Tithonian - Maastrichtian
Key time interval:Late/Upper Aptian
Age range of interval:122.46000 - 112.03000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Trinity Formation:Twin Mountains
Stratigraphic resolution:bed
Stratigraphy comments: ETE dating method: time_unit, ETE age comment: . radiometric intage_max, radiometric intage_min

low in Twin Mountains Fm.
Lithology and environment
Primary lithology:desiccation cracks,wave ripples,bioturbation,paleosol/pedogenic,green,red or brown claystone
Secondary lithology: siltstone
Includes fossils?Y
Lithology description: ETE rock type adj: "grn,motld red", ETE lithology comments: "clay,silt+sand" "five meters of green-mottled red clay, silt, and sand. Much of the sediment is massive owing either to original deposition or to bioturbation. Structures that are preserved, such as climbing ripples and settle-out laminae, are characteristic of low-energy deposition. Calcium carbonate nodules are common in the clays and silts...Sandstone dikes are present...V-shaped cracks outlined by green mottling and nodules form polygons that are one to two meters in diameter in plan view...The shape and sediment filling of these features suggest deep mud cracks on the floodplain." "the fossil bearing strata consist of 2 meters of reddish muds and sands. The cross-sectional profile contains stacked B horizons classified as well-developed calcic Vertisols which are interpreted to represent a semi-arid floodplain. Weathering indices of matrix collected from the paleosols estimate mean annual precipitation of ~330 mm/yr while crystallization temperature of pedogenic phyllosilicates indicate mean annual temperature of ~30 ± 3° C (approximately 13° C higher than modern temperatures at the same latitude)."
Environment:"floodplain"
Geology comments: ETE sed env 1: fluvial, ETE sed env 2: overbank ETE event: paleosol, ETE env comment: 0
"upland fluvial overbank sediments"; "semiarid to arid climatic conditions"
Taphonomy
Modes of preservation:body
Lagerst�tten type:concentrate
Degree of concentration:-multiple events
Size of fossils:macrofossils
Spatial orientation:life position
Preservation of anatomical detail:excellent
Articulated whole bodies:many
Associated major elements:some
Disassociated major elements:some
Disassociated minor elements:some
Size sorting:very poor
Fragmentation:occasional
Temporal resolution:time-averaged
Spatial resolution:autochthonous
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Collection size:100 specimens
Reason for describing collection:paleoecologic analysis
Collectors:D. Winkler Collection dates:1985
Collection method comments: ETE Size: .; ETE reference list: 478, 482, ; ETE museum list:
two main quarries are combined here: North Quarry and Camp Quarry. They are about 0.2 miles apart.
Metadata
Also known as:ETE Locality 1588, BMQ, 1B7, 2DU, 3BS
Database number:22713
Authorizer:A. Behrensmeyer, M. Carrano, P. Mannion Enterer:A. Behrensmeyer, P. Mannion, M. Carrano
Modifier:M. Carrano Research group:taphonomy,vertebrate
Created:2001-05-29 01:00:00 Last modified:2024-03-20 15:54:11
Access level:the public Released:2001-05-29 01:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

5720.ETE 1476D. A. Winkler, P. A. Murray, L. L. Jacobs, W. R. Downs, J. R. Branch and P. Trudel. 1988. The Proctor Lake dinosaur locality, Lower Cretaceous of Texas. Hunteria 2(5):1-8 [A. Behrensmeyer/A. Behrensmeyer/M. Carrano]

Secondary references:

52666 T. L. Adams. 2014. Small crocodyliform from the Lower Cretaceous (late Aptian) of central Texas and its systematic relationship to the evolution of Eusuchia. Journal of Paleontology 88(5):1031-1049 [P. Mannion/P. Mannion]
69410 T. L. Adams. 2019. Small terrestrial crocodyliform from the Lower Cretaceous (late Aptian) of central Texas and its implications on the paleoecology of the Proctor Lake dinosaur locality. Journal of Vertebrate Paleontology e1623226:1-15 [P. Mannion/P. Mannion]
87945 T. L. Adams and K. A. Andrzejewski. 2019. Revisiting the Proctor Lake Dinosaur Locality: new insights on the paleoecology and paleoenvironment. Society of Vertebrate Paleontology, Abstracts of Papers, 79th Annual Meeting 52 [M. Carrano/M. Carrano/M. Carrano]
68145 K. A. Andrzejewski, D. A. Winkler, and L. L. Jacobs. 2019. A new basal ornithopod (Dinosauria: Ornithischia) from the Early Cretaceous of Texas. PLoS One 14(3):e0207935:1-44 [M. Carrano/M. Carrano]
31500 P. M. Galton. 2009. Notes on Neocomian (Lower Cretaceous) ornithopod dinosaurs from England - Hypsilophodon, Valdosaurus, "Camptosaurus", "Iguanodon" - and referred specimens from Romania and elsewhere. Revue de Paléobiologie, Genève 28(1):211-273 [R. Butler/R. Butler]
18905ETE D. B. Norman, H.-D. Sues, L. M. Witmer and R. A. Coria. 2004. Basal Ornithopoda. In D. B. Weishampel, H. Osmolska, and P. Dodson (eds.), The Dinosauria (2nd edition). University of California Press, Berkeley 393-412 [M. Carrano/M. Carrano/M. Carrano]
59213 G. S. Paul. 1994. Thermal environments of dinosaur nestlings: implications for endothermy and insulation. In K. Carpenter, K. F. Hirsch & J. R. Horner (eds.), Dinosaur Eggs and Babies 279-287 [M. Carrano/M. Carrano]
7368 D. A. Winkler. 1994. Aspects of growth in the Early Cretaceous Proctor Lake ornithopod. Journal of Vertebrate Paleontology 14(3, suppl.):53 [M. Carrano/M. Carrano/J. Alroy]
10534ETE D. A. Winkler, P. A. Murry, and L. L. Jacobs. 1989. Ornithopod dinosaurs from the Lower Cretaceous Trinity Group, central Texas. Journal of Vertebrate Paleontology 9(3, suppl.):45A [M. Carrano/M. Carrano/M. Carrano]
14231ETE D. A. Winkler and P. A. Murry. 1989. Paleoecology and hypsilophodontid behavior at the Proctor Lake dinosaur locality (Early Cretaceous), Texas. In J. O. Farlow (ed.), Paleobiology of the Dinosaurs. Geological Society of America Special Paper 238:55-61 [M. Carrano/M. Carrano/M. Carrano]
7600 D. A. Winkler, P. A. Murry, and L. L. Jacobs. 1990. Early Cretaceous (Comanchean) vertebrates of central Texas. Journal of Vertebrate Paleontology 10(1):95-116 [J. Alroy/J. Alroy/J. Alroy]
14616ETE D. A. Winkler, P. A. Murry, and L. L. Jacobs. 1992. Differentiating adult and juvenile ornithischian dinosaurs in the Early Cretaceous. Journal of Vertebrate Paleontology 12(3, suppl.):60A [M. Carrano/M. Carrano/M. Carrano]