Where: Queensland, Australia (20.8° S, 148.1° E: paleocoordinates 57.0° S, 148.1° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Gebbie Formation, Roadian (272.3 - 268.8 Ma)

• Gebbie Formation assigned to the Echinalosia maxwelli, E. davidi, and E. discinia brachiopod zones of Briggs (1998). These zones are correlated with the APP3.3 palynomorph zone and APP4.1 for the upper E. discinia zone. Laurie et al. (2016) dated zircons from the Rowan Formation in the Sydney Basin (in the underlying upper Echinalosia preovalis zone, or upper APP3.2) as 271.60 and 271.89 Ma, constraining its upper part to Roadian, given a Roadian-Wordian boundary around 266.9 Ma (Wu et al., 2020). Strata in Western Australia assigned to APP4.1 yielded U-Pb ages of 269.25 Ma or younger, constraining the upper boundary of APP3.3 to the late Roadian (Laurie et al. 2016). As a result, APP3.3 appears to fall entirely within the Roadian. APP4.1 may extend into the Wordian, but a Roadian age is assigned to the formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified siliciclastic sediments

Size class: macrofossils

Primary reference: J. Armstrong. 1968. The martiniacean species occurring at Glendon, New South Wales, the type locality of Notospirifer darwini (Morris). Journal and Proceedings of the Royal Society of New South Wales 101:197-205 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 101551: authorized by Matthew Clapham, entered by Matthew Clapham on 24.12.2010

Creative Commons license: CC BY (attribution)