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UQ L4316, Ross Creek Tributary, Cracow Station (Permian of Australia)

Where: Queensland, Australia (25.4° S, 150.3° E: paleocoordinates 61.0° S, 153.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Echinalosia discinia brachiopod zone, Brae Formation, Roadian (272.5 - 268.0 Ma)

• Brachiopods suggest the Echinalosia discinia zone, correlated with the upper part of APP3.3 to APP4.1 palynomorph zone (Briggs, 1998). There are no direct radiometric constraints on APP3.3, although the top of the underlying APP3.2 is around 271.6 Ma (Laurie et al., 2016), placing it near the Kungurian-Roadian boundary or in the lower Roadian. 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. As a result, APP3.3 appears to fall entirely within the Roadian. The top of APP4.1 is likely late Wordian, constrained by earliest Capitanian radiometric dates in the lower part of APP4.2 (Laurie et al., 2016). The Broughton Formation, higher in the Sydney Basin succession, also yields an early Capitanian radiometric date (262.51 Ma) from its uppermost part, belonging to the upper part of APP4.2 (Metcalfe et al., 2015). Although the Brae Formation may extend to the Wordian, a Roadian age is assigned.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified siltstone

Size class: macrofossils

Reposited in the UQ

Primary reference: J. B. Waterhouse and D.J.C. Briggs. 1986. Late Palaeozoic Scyphozoa and Brachiopoda (Inarticulata, Strophomenida, Productida and Rhynchonellida) from the southeast Bowen Basin, Australia. Palaeontographica Abteilung A 193(1-4):1-76 [M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 66279: authorized by David Bottjer, entered by Matthew Clapham on 06.10.2006

Creative Commons license: CC BY (attribution)