Citation

Geoscience Australia provides most of its products for free under a Creative Commons Attribution 4.0 International Licence. We only require that you reference the use of our data or information using the following citation:
Nicoll, R.S., 1991. Differentiation of Late Cambrian-Early Ordovician species of Cordylodus (Conodonta) with biapical basal cavities. BMR Journal of Australian Geology and Geophysics  12:3:223-244. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

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 .
Google map showing geographic bounding box with values North bound -20.0 East bound 143.1 West bound 138.22 South bound -24.281
Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Product Type/Sub Type

nonGeographicDataset - GA Publication - Journal

Constraints

license
Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1991

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Journal
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-20.0
East bound
143.1
West bound
138.22
South bound
-24.281

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

fae9173a-70e8-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2015-05-19

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).