Overview
Identifiers
Inventory Number
3119DA1
Site Name
Reference stratotype: Tierberg Formation at Bloukrans Pass
Site Category
Geological
References
Reference Types
Book
Citation
SOUTH AFRICAN COMMITTEE FOR STRATIGRAPHY (1980). Stratigraphy of South Africa. Part 1: Lithostratigraphy of the Republic of South Africa, South West Africa/Namibia, and the Republics of Bophuthatswana, Transkei and Venda. Compiler: L.E. Kent. Handbook, Geological Survey of South Africa, No. 8, 690p.
Reference Types
Other Publication
Citation
COUNCIL FOR GEOSCIENCE (2001). Geological map of Sheet 3118 Calvinia (scale 1:250 000). Publication, Council for Geoscience, South Africa.
Date Retrieved
Reference Types
Other Publication
Citation
VILJOEN, J.H.A. (2005). Tierberg Formation. Catalogue of South African Lithostratigraphic Units (M.R. Johnson, ed.). South African Committee for Stratigraphy, Volume 8, pp. 8-37 - 8-40.
Record Administration
Author
doug.cole
Post date
Tuesday, October 29, 2013 - 10:42
Last modified
Thursday, May 2, 2024 - 18:19
Location
Location
Mapping
-31.69624, 19.74758
Northern Cape
  • Namakwa
  • Hantam
Grading
Autoid
Grading - 225395
Submitted by
Submitted by doug.cole on 29/10/2013 - 11:01.
Grading
Grade IIIb
Grading Date
GradingComment

Geological section along Bloukrans Pass, 25 km south of Calvinia. This covers the gently-dipping (< 5 degrees) Tierberg Formation and forms a reference stratotype. The site corresponds with the base of the formation where dark grey shale conformably overlies white-weathering, black shale of the Whitehill Formation with a sharp contact. A reference stratotype is an essential component of a defined stratigraphic unit and this locality should be classified as a local heritage site. Grading by: DOUG COLE

Significance criteria
Significance Categories
Understanding Natural or Cultural Heritage
Sphere of Significance
Local
Level
Low
Statement of Significance

The base of the Tierberg Formation reference stratotype is well-exposed at the base of Bloukrans Pass. Dark grey and greenish grey shale overlies the Whitehill Formation characterised by white-weathering, black carbonaceous shale. The boundary between the two formations is intruded by dolerite in places.

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