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• Purdy & Cranfield (2013) reported an unpublished SHRIMP date of 226±2 Ma for the Brisbane Tuff.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 H. Cribbs
• Found by H. Cribbs; University of Queensland Department of Geology collection
Primary reference: B. Dodds. 1949. Mid-Triassic Blattoidea from the Mount Crosby Insect Bed. Papers - Department of Geology, University of Queensland 3(10):1-11 [M. Clapham/J. Karr/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 122247: authorized by Matthew Clapham, entered by Jered Karr on 20.12.2011, edited by Matthew Clapham
Creative Commons license: CC BY (attribution)
Taxonomic list
| Insecta | |
"Eoses triassica n. gen. n. sp." = Mesochorista proavita
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Triassoblatta triquestra n. sp.
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