Also known as Mount Crosby
Where: Queensland, Australia (27.6° S, 152.8° E: paleocoordinates 58.5° S, 101.2° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Mount Crosby Formation (Ipswich Coal measures Group), 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• Purdy & Cranfield (2013) reported an unpublished SHRIMP date of 226±2 Ma for the Brisbane Tuff.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; 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.
•"Mounty Crosby formation…has 3 shale units, up to 6m thick near the bottom, middle & top of the unit. The upper two shale units are fossiliferous with prolific plant insect remains." Jell, 2004
Size classes: macrofossils, mesofossils
Preservation: adpression
Collected by O.A. Jones, A.K. Denmead
• Repository: University of Queensland Department of Geology collection
Primary reference: R. J. Tillyard. 1937. A small collection of fossil cockroach remains from the Triassic beds of Mount Crosby, Queensland. Proceedings of the Royal Society of Queensland 48:35-40 [M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 156626: authorized by Matthew Clapham, entered by Matthew Clapham on 27.05.2014
Creative Commons license: CC BY (attribution)
Taxonomic list
| Insecta | |
Triassoblatta jonesi n. sp., Triassoblatta denmeadi n. sp.
| |