PBDB Collection

Denmark Hill, new outcrop (UQ collection) (Triassic of Australia)

Where: Queensland, Australia (27.6° S, 152.8° E: paleocoordinates 58.6° S, 101.0° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Blackstone Formation (Ipswich Coal Measures Group), Norian (228.0 - 208.5 Ma)

• New bed near top of Ipswich Series, a slightly different horizon from the original Dunstan collection. Purdy & Cranfield (2013) reported an unpublished SHRIMP date of 226±2 Ma for the Brisbane Tuff.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: pond; lithified, sandy siltstone

• Interbedded sandstones and mudstones accumulated on levees bordering channels and graded laterally into floodplains where carbonaceous mudstones accumulated with thin crevasse splay sandstone beds.

•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.

• "The fossil insect bed of finely arenaceous shale. Near the outcrop the bed is of a brownish grey colour with iron-stained joints and planes." Dunstan, 1916 Fresher rock is a greenish grey colour.

Size classes: macrofossils, mesofossils

Preservation: mold/impression, adpression

Reposited in the UQ

Primary reference: E. F. Riek. 1956. A re-examination of the mecopteroid and orthopteroid fossils (Insecta) from the Triassic beds at Denmark Hill, Queensland, with descriptions of further specimens. Australian Journal of Zoology 4:98-110 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 153463: authorized by Matthew Clapham, entered by Matthew Clapham on 20.12.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Insecta
Orthoptera - Proparagryllacrididae	Proparagryllacris crassifemur Proparagryllacris crassifemur Riek 1956 grasshopper UQ C2134
Plecoptera - Euxenoperlidae	"Stenoperlidium triassicum n. sp." = Gondwanoperlidium triassicum "Stenoperlidium triassicum n. sp." = Gondwanoperlidium triassicum Riek 1956 stonefly UQ C2244(2245)
Neuroptera - Osmylopsychopidae	"Petropsychops superba n. gen. n. sp." = Petropsychops superbus "Petropsychops superba n. gen. n. sp." = Petropsychops superbus Riek 1956 lacewing UQ C2136(2135)
Mecoptera - Mesopsychidae	Mesopsyche triareolata Mesopsyche triareolata Tillyard 1917 scorpionfly UQ C2247(2246)