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Middle Cambrian agnostids : systematics and biostratigraphy

Created 17/10/2025

Updated 17/10/2025

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This Bulletin presents the taxonomy, temporal stratigraphy, palaeogeography, and ecology of the Middle Cambrian agnostid trilobites beginning with their arrival in the Templetonian and reaching an acme of diversification in Undillan time; agnostids of the latest Middle Cambrian were described earlier (bpik, 1961b, 1967). The material described now contains numerous complete specimens which supplied information regarding the morphology and function of the agnostid skeletons so far not attainable with certainty from disjointed sclerites. The nine named and one unnamed (the initial Templetonian) zones are integrated into four geographically named stages, completing the scale of stages by starting with the Ordian and leading into the early Upper Cambrian the. continuous sequence of stages reads; Ordlan, Templetonian, Floran, Undillan, Boomerangian; followed by the early Upper Cambrian Mindyallan and Idamean. The scale of the zones of the agnostid species is the pivot of the biostratigraphic documentation; it is the time scale A. H. Westergaard introduced in 1946 in Sweden. I have implemented this scale in Australia in the field and in unpublished and published reports for over two decades, but 'on parole', in advance of the descriptions and illustrations of the relevant fossils which are presented here.

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Field Value
Title Middle Cambrian agnostids : systematics and biostratigraphy
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/57e26f92-92aa-490f-8097-3574f6aa14b8
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Middle Cambrian agnostids : systematics and biostratigraphy". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/middle-cambrian-agnostids-systematics-and-biostratigraphy