Mount Crosby Insect Bed (Tillyard BMNH collection) (Triassic of Australia)

Where: Queensland, Australia (27.5° S, 152.8° E: paleocoordinates 58.5° S, 101.2° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mount Crosby Formation, Norian (228.0 - 208.5 Ma)

• Purdy & Cranfield (2013) reported an unpublished SHRIMP date of 226±2 Ma for the Brisbane Tuff. Therefore, the Blackstone Formation may be considered younger than 226 Ma in absolute age. Thus, the Ipswich Coal Measures above the Brisbane Tuff, which is to say, the succession from the Mount Crosby Formation to the top of the Blackstone Formation must now be considered Norian.

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - small; lithified shale

• Ipswich basin; transtensional rift in intermontane setting. Basin geometry affected by strike-slip movement along West Ipswich fault. Ipswich coal measures deposited near end of rifting phase.

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected by R.J. Tillyard; reposited in the BMNH

Primary reference: V. A. Blagoderov. 1999. New Bibionomorpha from the Triassic of Australia and Jurassic of central Asia with notes on Paraxymyiidae Rohdendorf (Insecta, Diptera). Proceedings of the First International Palaeoentomological Conference 11-15 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 113431: authorized by Matthew Clapham, entered by Matthew Clapham on 30.07.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Progonocimicidae
Platyscytinella paradoxa2, Microscytinella radians n. gen. n. sp.2, "Heteroscytina tillyardi" = Hexascytina tillyardi2, "Hexascytina transecta n. gen. n. sp." = Hexascytina tillyardi2
Platyscytinella paradoxa2 Evans 1956 true bug
BMNH In.44919, 44946
Microscytinella radians n. gen. n. sp.2 Wootton 1963 true bug
BMNH In.44920, 44901, 44912
"Heteroscytina tillyardi" = Hexascytina tillyardi2 Evans 1956 true bug
BMNH In.44905, 44908, 44927
"Hexascytina transecta n. gen. n. sp." = Hexascytina tillyardi2 Evans 1956 true bug
BMNH In.44923
 Diptera - Paraxymyiidae
Veriplecia handlirschi n. gen. n. sp.
Veriplecia handlirschi n. gen. n. sp. Blagoderov 1999 fungus gnat
 Diptera - Procramptonomyiidae
Austrocramptonomyia minuta n. gen. n. sp. Blagoderov 1999 fly
 Diptera - Tillyardipteridae
Tillyardiptera prima n. gen. n. sp.1
Tillyardiptera prima n. gen. n. sp.1 Lukashevich and Shcherbakov 1999 fly