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Quaternary fan and river terrace deposits, glen orchy, East Cape Drakensberg, South Africa

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  • Colin A. Lewis
  • Patricia M. Hanvey

Abstract

The processes responsible for the formation of fans and river terraces is deduced from sedimentological evidence. The older fans are a result of solifluction and may have formed between 24000 and ± 12000 years BP. A younger fan is predominantly composed of colluvium and accumulated in at least three phases, the most recent of which post‐dates ± 2440 years BP. The lower of the two solifluction fans has been partially reworked by fluvial action: some of the eroded debris has been redeposited and now forms a river terrace. La morphologie des cônes et des terrasses fluviales, en même temps que leur sedimentologie, est décrite. Les processus responables de la formation de ces dépôts ainsi que les conditions de l'environnement sous lesquelles ils se sont formés, sont déduits de l'étude sedimentologique. Les cônes les plus anciens se sont formés, probablement comme résultat de la gelifluction et peuvent être apparus entre ±24000 BP et ±12000 BP. L'existence de processus géryologiques en Afrique australe pendant le Quaternaire, qui jusqu'ici a été considérée comme contestable, est ainsi établie, Le cône plus récent est pour l'essential composé de colluvium et termoigne d'en au moins trois phases, dont la plus récente a eu lieu vers ±2440 BP. Le cône de gelifluction le plus bas a été én partie modifié par érosion fluviale: une partie du débris a été redéposée et forme maintenant une terrasse fluviale.

Suggested Citation

  • Colin A. Lewis & Patricia M. Hanvey, 1991. "Quaternary fan and river terrace deposits, glen orchy, East Cape Drakensberg, South Africa," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 2(1), pages 39-48, January.
    • Handle: RePEc:wly:perpro:v:2:y:1991:i:1:p:39-48
    DOI: 10.1002/ppp.3430020108
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