Also known as Pangjiapu

Where: Hebei, China (40.7° N, 115.4° E: paleocoordinates 0.0° N, 0.0° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Gaoyuzhuang Formation (Jixian Group), Calymmian (1600.0 - 1400.0 Ma)

• 170-190 m above the base of the lower member. Zhang's lower and upper members are separated by a manganese-bearing dolomite, which indicates that this collection falls within the upper part of Member II of more recent papers. A volcanic tuff in the lower third of the overlying Member III was dated at 1577 +/- 12 Ma by Tian et al., 2015. The unconformably underlying Dahongyu Formation yielded U-Pb ages of 1625.3 +/- 6.2 Ma and 1626.9 +/- 8.9 Ma (Lu & Li, 1991, Gao et al., 2008).

• group of beds-level stratigraphic resolution

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

Size class: microfossils

Preservation: permineralized, original carbon, replaced with silica

Collection methods: peel or thin section

• Repository: Department of Geology, Beijing University

Primary reference: Y. Zhang. 1981. Proterozoic stromatolite microfloras of the Gaoyuzhuang Formation (Early Sinian: Riphean), Hebei, China. Journal of Paleontology 55:485-506 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227616: authorized by Matthew Clapham, entered by Matthew Clapham on 21.10.2022

Creative Commons license: CC BY (attribution)