7km SE of Picton (Triassic of Australia)

Where: New South Wales, Australia (34.2° S, 150.7° E: paleocoordinates 64.1° S, 134.1° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Rouse Hill Siltstone Member (Ashfield Shale Formation), Anisian (247.2 - 242.0 Ma)

• Rouse Hill Siltstone is lowest member of the Ashfield Shale Formation, which is itself the basal formation in the Wianamatta Group (see Warren 2012: fig. 1). The Rouse Hill Siltstone overlies the Mittagong and Hawkesbury Sandstone formations. The Ashfield Shale has been asigned an Anisian age on the basis of palynomorphs (Aratrisporites parvispinosus Assemblage Zone) and plant macrofossils.

• bed-level stratigraphic resolution

Environment/lithology: marine; nodular, sideritic, black, gray, silty claystone

• "the Rouse Hill Siltstone is composed of dark gray to black, sideritic, silty claystone that is slightly carbonaceous in some areas. The vertebrate fauna is largely confined to the sideritic layers, with the larger fish and stereospondyls preserved in ironstone nodules"

Size class: macrofossils

Collected by S. Avery

Collection methods: mechanical

• AM: Australian Museum, Sydney

Primary reference: A. Warren. 2012. The South African stereospondyl Microposaurus from the Middle Triassic of the Sydney Basin, Australia. Journal of Vertebrate Paleontology 32(3):538-544 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136481: authorized by Richard Butler, entered by Richard Butler on 28.11.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Xenacanthiformes - Xenacanthidae
Xenacanthidae indet. Fritsch 1889 elasmobranch
Osteichthyes
 Temnospondyli - Trematosauridae
Microposaurus averyi n. sp. Warren 2012 tetrapod
AM F.135895, anterior half of skull with attached mandibles (holotype)