Nannofossil and planktic foraminiferal biostratigraphy around the Oligocene-Miocene boundary in parts of the Indo-Pacific region

Nannofossil evidence suggests that the up-sequence appearance of Globigerinoides quadrilobatus primordius is depth-related, and first occurs at a lower stratigraphic level in shallow marginal-marine than in deep oceanic sediments. The species is recorded associated with several late Oligocene nannofossil species, such as Sphenolithus ciperoensis, in three marginal-marine sections within the Indo-Pacific region; a study of the literature has revealed similar coeval occurrences elsewhere. However, evidence in deep oceanic sediments indicates that the lowest occurrence of G. quadrilobatus primordius is early Miocene in age. Globorotalia opima opima occurs with G. quadrilobatus primordius in one section; published data indicate that this overlap is repeated elsewhere. This suggests that the planktic foraminiferal Zones N.3 and N.4 should be combined into Zone N3/4, the base of which is defined by the lowest occurrence of Globigerinoides quadrilobatus primordius. To account for the difference in the timing of the lowest occurrence of G. quadrilobatus primordius in hemipelagic and oceanic sediments, changes in the thickness of the zone between the lysocline and carbonate compensation depth during the latest Oligocene, and bathymetric shifts of this zone during the earliest Miocene, are invoked. Evidence for precisely delineating the Oligocene-Miocene boundary is tenuous; the Globigerinoides datum is late Oligocene in age, contrary to the unratified recommendation of the Neogene Committee at Bologna in 1967, and at present no general agreement has been reached on nannofossil evidence to mark the boundary. For these reasons, a buffer zone representing the Oligocene-Miocene transition is suggested for the interval between the definite late Oligocene Sphenolithus ciperoensis (extinction) datum and the definite early Miocene Sphenolithus belemnos (base of range) datum. In hemipelagic sediments, this buffer zone may include several biostratigraphic events, such as the disappearance of the solution-prone Zygrhablithus bijugatus.

Simple

Identification info

Date (Publication)
1978-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/80954

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Bureau of Mineral Resources, Geology and Geophysics

 Canberra
Author

Shafik, S.

 1
Author

Chaproniere, G.C.H.

 2
Name

BMR Journal of Australian Geology and Geophysics

Issue identification

3:2:135-151

Point of contact
Role Organisation / Individual Name Details
Custodian

Corp
Owner

Commonwealth of Australia (Geoscience Australia)
Custodian

Commonwealth of Australia (Geoscience Australia)

 Voice
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
Unknown

Resource format

Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

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

Keywords

  • GA Publication

  • Journal

Keywords

  • AUS

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

 Voice
OnLine resource

Journal article (pdf)

Journal article (pdf)

Distribution format

  • pdf

Resource lineage

Statement

Unknown

Hierarchy level
Non geographic dataset
Other

GA Publication

Description

Source data not available.

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/fae9173a-6f97-71e4-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice

Type of resource

Resource scope
Document
Name

AGSO BMR Journal

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/80954

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-6f97-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:08:39
Date info (Creation)
2014-06-03T00:00:00

Metadata standard

Title

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

 
 

Spatial extent

N
S
E
W



Provided by

Access to the portal

Associated resources

Not available