Where: Texas (31.1° N, 105.0° W: paleocoordinates 0.0° N, 0.0° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Allamoore Formation, Ectasian (1400.0 - 1200.0 Ma)

• "Due to structural complexities, it has not been possible to determine the exact stratigraphic position. Available evidence suggests that the fossiliferous cherts probably occur in the middle portion of the exposed Allamoore strata." (Nyberg & Schopf, 1981) "The Allamoore Formation contains tuffs with a zircon ID-TIMS U-Pb age of 1256 ± 5 Ma (upper part) and 1253 ±15 Ma in the middle part above the chert-bearing carbonate. The underlying Hackett Peak Formation was intruded by a 1325 ± 12 Ma pegmatite and a 1333 ± 10 Ma metarhyolite sill in the east-central Carrizo Mountains." (Bickford et al., 2000).

• bed-level stratigraphic resolution

Environment/lithology: peritidal; lithified, stromatolitic, cherty/siliceous dolomite

Size class: microfossils

Preservation: permineralized, original carbon, replaced with silica

Collected by A. V. Nyberg in 1979

Collection methods: peel or thin section

Primary reference: A. V. Nyberg and J. W. Schopf. 1981. Microfossils in stromatolitic cherts from the Proterozoic Allamoore Formation of west Texas. Precambrian Research 16:129-141 [M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 227756: authorized by Matthew Clapham, entered by Matthew Clapham on 29.10.2022

Creative Commons license: CC BY (attribution)