Midway Point (Triassic of Australia)

Where: Tasmania, Australia (42.8° S, 147.5° E: paleocoordinates 75.9° S, 133.0° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Knocklofty Formation, Induan (252.2 - 251.2 Ma)

• Palynology and vertebrate biostratigraphy have been used to argue for an earliest Triassic age for the Knocklofty Formation (Cosgriff 1974; Camp & Banks 1978).

• bed-level stratigraphic resolution

Environment/lithology: "channel"; pebbly, muddy conglomerate

• "Bed of a small stream" (Cosgriff 1974)
• "Clay-pebble conglomerate"

Size class: macrofossils

Collected by JW Cosgriff in the 1960s

• UTGD: Geology Department, University of Tasmania, Hobart.

Primary reference: J. W. Cosgriff. 1974. Lower Triassic Temnospondyli of Tasmania. The Geological Society of America, Special Paper 149:1-134 [R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136591: authorized by Richard Butler, entered by Richard Butler on 30.11.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Actinopteri
 Saurichthyiformes - Saurichthyidae
Saurichthys sp. Agassiz 1843
Osteichthyes
 Dipnoi - Ceratodontidae
Ceratodus sp. Agassiz 1838 lungfish
 Temnospondyli - Brachyopidae
"Blinasaurus townrowi" = Banksiops townrowi
"Blinasaurus townrowi" = Banksiops townrowi Cosgriff 1974 tetrapod
Incomplete skull, UTGD 87771; skull fragments, UTGD 85708, 85710, 85741, 85749, 85757, 87772, 87773, 87774, 87775, 87776, and 87807; lower jaw fragments, UTGD 85700, 85701, 85702, 85750, 85766, 85784, 85785, 87805, and 87806; MUZD 1962 and 2094.
 Temnospondyli -
Watsonisuchus sp. Ochev 1966 tetrapod
skull roof fragments UTGD 85745 and 85746.
 Temnospondyli - Lydekkerinidae
Chomatobatrachus halei Cosgriff 1974 tetrapod
Skull fragments, UTGD 85709, 85730, and 87786, complete left lower jaw ramus, UTGD 85704; lower jaw fragments, UTGD 85705, 85706, 85783, 87803, and 87804; MUZD 1962.
 Temnospondyli - Rhytidosteidae
Deltasaurus kimberleyensis Cosgriff 1965 tetrapod
UTGD 85746, a complete right parietal bone
 Temnospondyli - Derwentiidae
Derwentia warreni Cosgriff 1974 tetrapod
UTGD 87783, fragment from anterior part of palatal surface of a skull