Lancefield Bone Bed (Unit IVa) (Pleistocene of Australia)

Where: Victoria, Australia (37.3° S, 144.7° E: paleocoordinates 37.3° S, 144.7° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Late/Upper Pleistocene (0.1 - 0.0 Ma)

• "3.5 m of an alluvial clay overlying Pliocene basalts" including a "~ 0.2-m-thick bone bed"; radiocarbon dates from the bone bed range from 8775 +/- 260 ybp (which is regarded as a low minimum) to 19,800 +/- 450 ybp (the only date regarded as accurate), but the "roughly contemporary" underlying channel fill is dated at 25,200 +/- 800 and 26,600 +/- 650 ybp

• bed-level stratigraphic resolution

Environment/lithology: mire or swamp; paleosol/pedogenic, shelly/skeletal, black, green, conglomeratic claystone

• "free water occupied the site, at least seasonally" but "the surrounding plains were virtually treeless" with probable "annual rainfall... slightly less than 500 mm/year"
• "The bones interlock as a horizontal network, in a matrix of greenish clay to black clay and gravelly clay. Laterite fragments and pellets are the dominant clastic materials"

Size class: macrofossils

• "Some of the bones... show the toothmarks" of Thylacoleo and "a large quartzite blade... was found firmly embedded in the bone bed"

Preservation: original phosphate

Collected in 1974, 1975, 1977

Collection methods: bulk, quarrying, sieve,

• "The 1975 excavation of 5 m2 yielded some 3000 bones, representing a minimum number of individuals of 72 for all species" with 90% being Macropus titan, 7% being Protemnodon, and all other species accounting for < 1%; excavated sediment was apparently screened

Primary reference: R. Gillespie, D. R. Horton, P. Ladd, P. G. Macumber, T. H. Rich, R. Thorne, and R. V. S. Wright. 1978. Lancefield swamp and the extinction of the Australian megafauna. Science 200:1044-1048 [J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 92836: authorized by John Alroy, entered by John Alroy on 01.12.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• all plants are represented by pollen
Mammalia
 Diprotodontia - Diprotodontidae
Diprotodon sp. Owen 1838 diprotodont marsupial
 Diprotodontia -
Sthenurus occidentalis short-faced kangaroo
 Diprotodontia - Macropodidae
Protemnodon anak Owen 1874 kangaroo
Protemnodon cf. brehus Owen 1874 kangaroo
"Macropus titan" = Macropus (Macropus) giganteus Shaw 1790 eastern grey kangaroo
Aves
 Dromornithiformes - Dromornithidae
cf. Genyornis sp. Stirling and Zietz 1896 bird
 Casuariiformes - Casuariidae
Dromaius sp. Vieillot 1816 emu
Amphibia
 Temnospondyli - Brachyopidae
"Banksia sp." = Banksiops
"Banksia sp." = Banksiops Warren and Marsicano 2000 tetrapod
Angiospermae
 Poales - Cyperaceae
Cyperaceae indet. Jussieu 1789 sedge
 Poales - Poaceae
Poaceae indet. Barnhart 1895 grass
 Alismatales - Juncaginaceae
Triglochin sp. Linnaeus 1753 arrowgrass
 Arales - Lemnaceae
Lemna sp. Linnaeus 1753 duckweed
Dicotyledoneae
 Myrtales - Myrtaceae
Myrtaceae indet. de Jussieu 1789 myrtle
Leptospermum sp. Forster and Forster 1775 myrtle