Where: Western Australia, Australia (21.1° S, 119.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Dresser Formation (Warrawoona Group), Paleoarchean (3600.0 - 3200.0 Ma)

• Apparently low in the northeast flank sequence, but the precise layer has not been relocated and its detailed stratigraphic relations are unknown. The timing of the sedimentation of the Dresser Formation is constrained by the youngest 207Pb/206Pb age of 3481 +/- 3.6 Ma in detrital zircons from a volcaniclastic sandstone (Van Kranendonk et al., 2008). However, other 30 analyses define a single population with a weighted mean age of 3525.3 +/- 1.8 Ma (Van Kranendonk et al., 2008), which can be a more robust estimate of the maximum depositional age of the Dresser Formation. The minimum age is constrained by a U-Pb Concordia age of 3454 +/- 17 Ma of the North Pole Dome adamellite that intrudes the the Warrawoona Group (Asanuma et al., 2018).

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, stromatolitic chert

Size class: microfossils

Preservation: permineralized, original carbon, replaced with silica

Collection methods: peel or thin section

• Repository: Commonwealth Palaeontology Collection

Primary reference: S. M. Awramik, J. W. Schopf, and M. R. Walter. 1983. Filamentous bacteria from the Archean of Western Australia. Precambrian Research 20:357-374 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227837: authorized by Matthew Clapham, entered by Matthew Clapham on 04.11.2022

Creative Commons license: CC0 (CC0)