Where: Queensland, Australia (24.7° S, 150.0° E: paleocoordinates 58.2° S, 140.4° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Kaloola Member (Baralaba Coal Measures Formation), Changhsingian (254.2 - 252.2 Ma)

• Further calibration using U-Pb Zircon CA-ID-TIMS of tuff beds within the morphotectonic zones within the Bowen Basin yielded dates of 254.10 ±0.09 Ma to 252.54±0.05 Ma for the Kaloola Member in Meeleebee 5 well on the Roma shelf, bracketing the age of the Kaloola Member (Metcalfe et al. 2015; Laurie et al. 2016). The uppermost tuff in the Kaloola Member, the Yarrabee Tuff (YTB), was identified from both CA-ID-TIMS and geochemical analyses and was the last major tuff in the late Permian coal measures of the Bowen Basin, and is a stratigraphically significant marker across the Basin (Ayaz et al. 2016; Sliwa et al. 2017). The YTB was dated by CA-ID-TIMS to 252.69 ± 0.16 Ma in Duckworth 11 well, 253.07 ± 0.22 Ma in the Crocker Gully 2 well and < 252.58 ± 0.23 Ma in Peat 1 well and therefore coincides with the age of the uppermost Meeleebee 5 tuff layer (Ayaz et al. 2016). Sliwa et al. (2017) suggested that the YTB was extensive and is represented by repeated depositional episodes. Pb Zircon CA-ID-TIMS of 5 accessory tuffs in Meeleebee 5 ranged in age from 252.54 ±0.05 Ma to 254.10 ± 0.09 Ma, and the basal tuff is interpreted as correlating with the base of the Kaloola Member (Laurie et al. 2016, Fig. 15; Metcalfe et al. 2015).

• bed-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; lithified, cherty/siliceous mudstone

Size class: macrofossils

Collection methods: Repository: Queensland Museum

Primary reference: M. J. Poschmann and A. Rozefelds. 2022. The last eurypterid - a southern high-latitude record of sweep-feeding sea scorpion from Australia constrains the timing of their extinction. Historical Biology 34:2020-2030 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227842: authorized by Matthew Clapham, entered by Matthew Clapham on 05.11.2022

Creative Commons license: CC BY (attribution)