Submitted by doug.cole on Tue, 10/29/2013 - 11:01
Inventory Reference
GEO050
Formal Gradings
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

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.

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