QML796 (Horizon A1)
Basic information
Sample name: QML796 (Horizon A1)
Reference: G. J. Price and G. E. Webb. 2006. Late Pleistocene sedimentology, taphonomy and megafauna extinction on the Darling Downs, southeastern Queensland. Australian Journal of Earth Sciences 53(6):947-970 [ER 3685]
Geography
Country: Australia
State: Queensland
Coordinate: 27° 56' S, 151° 51' E
Coordinate basis: estimated from map
Time interval: Late Pleistocene
Section: 3685
Unit number: 1
Unit order: above to below
Max Ma: 0.055
Min Ma: 0.0548
Age basis: U/Th
Geography comments: "Site QML796 is located in the northern bank of Kings Creek, in the Darling Downs, southeastern Queensland, around 200 m downstream from site QML1396".
Two U/Th dates on fossilised teeth from Horizon A1 range from 55.0 ± 0.3 ka to 54.8 ± 0.6 ka (Price et al. 2011).
Earlier U/Th and C14 dates on bivalve shells are considered to be unreliable.
Two U/Th dates on fossilised teeth from Horizon A1 range from 55.0 ± 0.3 ka to 54.8 ± 0.6 ka (Price et al. 2011).
Earlier U/Th and C14 dates on bivalve shells are considered to be unreliable.
Environment
Lithology: siliciclastic (mixed)
Taphonomic context: fluvial deposit,overbank deposit
Habitat comments: "The modern Kings Creek catchment is fed from the east by shallow, ephemeral watercourses".
The QML796 deposit contains both high-velocity lateral accretion (channel) and low-velocity vertical accretion (overbank) deposits with three highly fossiliferous horizons".
"The A1 horizon is the uppermost unit, and its geometry indicates crevasse channel and splay deposition on the floodplain adjacent to the channel belt".
"Taphonomic data suggest that most of the identifiable material was accumulated and transported into the deposit from the surrounding proximal floodplain, with the small size of the palaeocatchment precluding any long distance transport of the material".
The QML796 deposit contains both high-velocity lateral accretion (channel) and low-velocity vertical accretion (overbank) deposits with three highly fossiliferous horizons".
"The A1 horizon is the uppermost unit, and its geometry indicates crevasse channel and splay deposition on the floodplain adjacent to the channel belt".
"Taphonomic data suggest that most of the identifiable material was accumulated and transported into the deposit from the surrounding proximal floodplain, with the small size of the palaeocatchment precluding any long distance transport of the material".
Methods
Life forms: rodents,other large mammals,other small mammals,birds,lizards,snakes,turtles,other reptiles,frogs,fishes,snails
Sampling methods: quarry,screenwash
Sample size: 336 specimens
Sampling comments: "Fossils were recovered from an exposed vertical section by in situ collecting and removal of bulk sediment to target smaller specimens".
"A 3x2 m plot was surveyed on the ground above the site, and 1x1 m quadrats were excavated in 10 cm increments using trowels and brushes".
"The excavation continued to a depth of 2.3 metres, yielding a total of 24 cubic metres of sediment and material processed".
"Excavated sediment was washed using 10 and 1 mm graded sieves".
"Specimens of Velesunio ambiguus, Corbicula australis (bivalves) and Plotiopsis balonnensis (a freshwater gastropod) were extremely common in each main fossiliferous horizon (represented by several thousand individuals), and thus, their abundance data were not recorded".
"A 3x2 m plot was surveyed on the ground above the site, and 1x1 m quadrats were excavated in 10 cm increments using trowels and brushes".
"The excavation continued to a depth of 2.3 metres, yielding a total of 24 cubic metres of sediment and material processed".
"Excavated sediment was washed using 10 and 1 mm graded sieves".
"Specimens of Velesunio ambiguus, Corbicula australis (bivalves) and Plotiopsis balonnensis (a freshwater gastropod) were extremely common in each main fossiliferous horizon (represented by several thousand individuals), and thus, their abundance data were not recorded".
Metadata
Sample number: 3851
Contributor: Benjamin Carter
Enterer: Benjamin Carter
Modifier no: John Alroy
Created: 2022-01-19 16:35:58
Modified: 2024-11-15 11:14:01
Abundance distribution
33 species
10 singletons
total count 336
geometric series index: 60.1
Fisher's α: 9.069
geometric series k: 0.8671
Hurlbert's PIE: 0.8496
Shannon's H: 2.4540
Good's u: 0.9703
Each square represents a species. Square sizes are proportional to counts.
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