Natal Group - the first sediments of a new continent

Natal group

 


 

The first sedimentary sequence deposited on the new basement was the Cambrian to Ordovician Natal Group (490 million years ago).

 

Structures preserved in these sandstones indicate that the sediments were transported and deposited by rivers that drained highlands to the northeast. Close to their source, in northern KZN, deep valleys were infilled with thick accumulations of boulders and pebbles.

 

 

Kranskloof 

Natal group sandstone, Kranskloof

 Natal group sandstone

Mgeni River, Valley of the Thousand Hills. Contact between the Natal Metamorphic Province granite and the Natal group sandstone


Further south the sediment is finer grained and forms resistant sandstone cliffs. These give rise to the table top topography seen in the Valley of a Thousand Hills and Oribi Gorge near Port Shepstone.

 

Oribi Gorge

Oribi gorge

(source: http://en.wikipedia.org/wiki/Oribi_Gorge)

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