Elcho Island Formation, Tembi and Second Beaches (Cambrian of Australia)

Where: Northern Territory, Australia (12.0° S, 136.0° E: paleocoordinates 31.6° N, 178.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Elcho Island Formation (Wessel Group), Templetonian (508.0 - 504.5 Ma)

• Listed as pre-Ptychagnostus gibbosus

Environment/lithology: offshore; lithified, fine-grained sandstone and lithified siltstone

• Strata unburied and transported (with fragmentation, rounding, etc...) by tides along strand line along wave cut platform. "Low energy, probably cool and/or deep water, ocean-facing depositional environment"; based on adjacent strata, it appears that this could be a deep carbonate platform setting (much dolomitic muds), with occasional fine-grained siliciclastic pulses; so this may be shallower than 4.5
• Angular blocks and rounded pebbles of finely laminated, fine-grained quartz sandstone and siliceous siltstone

Size classes: macrofossils, mesofossils

Primary reference: K. A. Plumb, J.H. Shergold, and M.Z. Stefanski. 1976. Significance of Middle Cambrian trilobites from Elcho Island, Northern Territory. BMR Journal of Australian Geology and Geophysics 1:51-55 [P. Novack-Gottshall/P. Hearn]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 75265: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 01.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Porifera indet., Xystridurida indet.
Porifera indet. Grant 1836
Spicules
Trilobita
 Ptychopariida - Ptychopariidae
Lyriaspis cf. sigillum
 Corynexochida - Oryctocephalidae
Oryctocephalites runcinatus
Oryctocephalites runcinatus Shergold 1969 trilobite
 Redlichiida - Xystriduridae
Xystridura cf. templetonensis
Artiopoda
 Agnostida - Eodiscidae
Pagetia cf. significans, Pagetia aff. significans, Pagetia sp. n. sp.
Pagetia sp. n. sp. Walcott 1916
 Agnostida - Peronopsidae
"Peronopsis cf. normata" = Peronopsis (Proacadagnostus) normata
"Peronopsis cf. normata" = Peronopsis (Proacadagnostus) normata Whitehouse 1936
 Bradoriida -
aff. Indota sp.
aff. Indota sp. Opik 1968
Inarticulata
  -
Inarticulata indet.
Hyolitha
 Hyolithida - Hyolithidae
Hyolithes sp.
Hyolithes sp. d'Eichwald 1840