Section 411, Georgina Basin, Thorntonia Area (Cambrian of Australia)

Where: Queensland, Australia (19.5° S, 138.9° E: paleocoordinates 26.8° N, 172.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Ptychagnostus atavus / Euagnostus opimus trilobite zone, Gowers Formation, Floran (504.5 - 503.0 Ma)

• Ptychagnostus atavus / Euagnostus opimus zone

• group of beds-level stratigraphic resolution

Environment/lithology: sand shoal; lithified, phosphatic lime mudstone

• intracratonic basin; environment classification based on lithology. From Kruse (2002), not this paper.
• more or less phosphatic, locally silicified, planar laminated calcimudstone with intervals of hardgrounds, nodules and phoscrete crusts and lags. Component phosphate grains include peloids, coated grains intraclasts and bioclasts. From Kruse (2002), not this paper.

Size class: microfossils

Preservation: mold/impression, recrystallized, replaced with phosphate

Collection methods: bulk,

• All fossils are deposited in the Commonwealth Palaeontological Collections (CPC), Geoscience Australia, Canberra, under accession numbers 39705–39777.

Primary reference: M. J. Vendrasco, S. M. Porter, A. Kouchinsky, G. Li, and C. Z. Fernandez. 2010. New data on molluscs and their shell microstructures from the Middle Cambrian Gowers Formation, Australia. Palaeontology 53(1):97-135 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 93421: authorized by Pete Wagner, entered by Pete Wagner on 18.01.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Helcionelloida
 Helcionellida - Stenothecidae
"Ribeiria junior" = Acanthotheca junior
"Ribeiria junior" = Acanthotheca junior Runnegar 1996