Also known as G. spiralis, Greyson Shale, Tianjin, China - Walter et. al 1990

Where: Tianjin, China (39.1° N, 117.2° E: paleocoordinates 39.1° N, 117.2° E)

• coordinate based on political unit

• outcrop-level geographic resolution

When: No. 4 Member (Gaoyuzhuang Formation), Neoproterozoic (1000.0 - 541.0 Ma)

• The Gaoyuzhuang Formation is part of the Changcheng ""System"" and disconformably overlies the Dahongyu Formation and is conformably overlain by the Yangzhuang Formation. Fossils occur in the lower portion of member 4 in a single 5-8cm thick bed of green or dark gray carbonaceous marly dolomite and are focused in a 4-5cm layer of dolomitic claystone at the top of the dolomite bed.

• bed-level stratigraphic resolution

Environment/lithology: lithified, gray, green, argillaceous, carbonaceous dolomite and lithified claystone

Size class: macrofossils

Preservation: mold/impression

Collection methods: Strata containing fossils is thought to be 1400 Ma old (Chen, 1985) or up to 1700 Ma (Plumb and James, 1986)

Primary reference: M. R. Walter, D. U. Rulin, and R. J. Horodyski. 1990. Coiled carbonaceous megafossils from the Middle Proterozoic of Jixian (Tianjin) and Montana. American Journal of Science 290-A:133-148 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 10312: authorized by Mark Patzkowsky, entered by Phil Borkow on 03.04.2001

Creative Commons license: CC BY (attribution)