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North Quarry/Camp Quarry, Proctor Lake (SMU 001) (Cretaceous of the United States)

Also known as ETE Locality 1588, BMQ, 1B7, 2DU, 3BS

Where: Comanche County, Texas (32.0° N, 98.5° W: paleocoordinates 30.3° N, 52.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Twin Mountains Formation (Trinity Group), Aptian (125.5 - 112.6 Ma)

• ETE dating method: time_unit, ETE age comment: . radiometric intage_max, radiometric intage_min

•low in Twin Mountains Fm.

• bed-level stratigraphic resolution

Environment/lithology: "floodplain"; bioturbated, paleosol/pedogenic, green claystone and siltstone

• 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"

• 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."

Size class: macrofossils

Collected by D. Winkler in 1985

Collection methods: quarrying, mechanical,

• 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.

Primary reference: D. 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] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 22713: authorized by Anna Behrensmeyer, entered by Anna Behrensmeyer on 29.05.2001, edited by Philip Mannion and Matthew Carrano

Creative Commons license: CC BY (attribution)