Kinney Quarry, Manzanita Mountains, unit 6 (Dunbarella beds) (Carboniferous of the United States)

Where: Bernalillo County, New Mexico (34.9° N, 106.3° W)

• Paleocoordinates: 1.9° N, 35.4° W (Wright 2013)

• coordinate estimated from map

When: Pine Shadow Member (Wild Cow Formation), Virgilian (303.7 - 298.9 Ma)

• Wild Cow Formation, which is composed of rhythmic sequences of arkosic sandstone, gray, tan, and red shale, and gray marine limestone of Missourian to earliest Wolfcamian age. Myers (1973, 1988) recognized three members of the Wild Cow, in ascending order Sol de Mete, Pine Shadow, and La Casa. About 28 m of the Pine Shadow Member (lower Virgilian) are exposed in the Kinney Quarry... the member consiste generally of gray marine limstones alternating with marine or nonmarine shale, sandstone, and conglomerate. Lateral facies changes within the Pine Shadow Member are pronounced...early Virgilian age is based on studies of fusulinids.

Environment/lithology: prodelta; shale and claystone

• greater fresh-water influence and lower salinity than units 2-4; current activity and water agitation were essentially nil; environment seems to have been a low-salinity, perhaps nearly freshwater environment; one can visualize the unit as remote from marine environments and possibly enclosed or nearly enclosed by delta-plain lobes - alternatively tidal cycles could have left their sedimentary imprint (mud-crack structures are observed)

•ref #75170: increase of sedimentation rate, concurrent with migration of a fluvial system into the bay nearby; unit may in fact represent a distal prodelta facies

•ref #75099: lack of bottom dwellers indicates unfavorable conditions

• Thickness: 0.8 m

•Fig. 5: shale and claystone; shale is olive gray (5 Y 3/2); claystone is dark greenish gray (5 GY 4/1); very calcareous; highly fossiliferous, especially with moderate yellowish-brown (10 YR 5/4) Dunbarella

•text: Unit 6 contains dark greenish-gray claystone intervals; individual laminae are continous on strike for at least 10 m; in much of the section bedding planes at the contact between successive laminae are richly fossiliferous; laminae seem to have been deposited cyclic

•ref #75170: laminated character of shales persists as the become less organic, less calcareous, increasingly silty; bands of plastic clay

Size classes: macrofossils, mesofossils, microfossils

• Nearly all of the published fossils from the Kinney Quarry have been collected from units 3 and 4.

Primary reference: B.S. Kues and S.G. Lucas. 1992. Overview of Upper Pennsylvanian stratigraphy and paleontology, Kinney Quarry, Manzanita Mountains, New Mexico. New Mexico Bureau of Mines & Mineral Resources, Bulletin 138:1-11 [B. Seuss/B. Seuss/B. Seuss]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 216996: authorized by Barbara Seuss, entered by Barbara Seuss on 12.01.2021

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Insecta indet., Fish indet., Eurypterida indet.
Osteichthyes
 Actinopterygii -
Actinopterygii indet.
Actinopterygii indet. Cope 1887 ray-finned fish
Bivalvia
 Pectinida - Pterinopectinidae
Dunbarella rectalaterarea
Dunbarella rectalaterarea scallop
large sizes; 35 - 42 mm long
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
Walchia
  -
Walchia sp.
Walchia sp. Sternberg 1825
unclassified
  -
Pteridospermophyta indet.