Differentiation of Late Cambrian-Early Ordovician species of Cordylodus (Conodonta) with biapical basal cavities

Four species of the conodont genus Cordylodus are recognised, containing elements that have two apices in the basal cavity (biapical), one extending into the cusp and the other into the first denticle of the posterior process. They are C. prion Lindstrom 1955, C. lindstromi Druce and Jones, 1971, C. prolindstromi sp. nov. and C. sp. nov. B. Cordylodus sp. nov. B has been found only in a single sample and insufficient material is available to establish limits of element morphological variability. In the Ninmaroo Formation of the Georgina Basin, northern Australia, C. prolindstromi sp. nov. is found stratigraphically below the first occurrence of C. lindstromi. This relationship may be important in the resolution of the placement of the Cambrian-Ordovician boundary. In all four species, the biapical cavity is best developed in the S elements, poorly developed in the P elements and, except in C. prion, absent in the M element. Multiple basal cavity apices that extend into the cusp and into the base of one or more denticles of the posterior process, may be found in aberrant specimens of most species of Cordylodus, but the consistent presence of the biapical cavity seems to be limited to these four species of the genus. There has been some confusion in the literature about the application of the name Cordylodus lindstromi and most previous identifications of C. lindstromi now need re-evaluation in the light of the species definitions established here .

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Date (Publication)
1991-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81291

Cited responsible party
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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
Author

Nicoll, R.S.

 1
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BMR Journal of Australian Geology and Geophysics

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12:3:223-244

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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Product data repository: Various Formats

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Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

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Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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Creative Commons Attribution 4.0 International Licence

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4.0

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2018-11-01T00:00:00
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English
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UTF8

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Journal article (pdf)

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Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

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urn:uuid/fae9173a-70e8-71e4-e044-00144fdd4fa6

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Language
English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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Document
Name

AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

uuid

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eCatId/81291

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-70e8-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:09:45
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2014-06-03T00:00:00

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AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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