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On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa
Thesis (PhD)--University of Pretoria, 2003.
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University of Pretoria
2021
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| _version_ | 1867613497159843840 |
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| access_status_str | Open Access |
| author2 | Meiklejohn, K.I. (Ian) |
| author_browse | Meiklejohn, K.I. (Ian) |
| author_facet | Meiklejohn, K.I. (Ian) |
| collection | Thesis |
| dc_rights_str_mv | © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD)--University of Pretoria, 2003. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/82501 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:05.077Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/82501 On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa Meiklejohn, K.I. (Ian) Sumner, Paul UCTD geomorphic evidence Thesis (PhD)--University of Pretoria, 2003. Conflicting reports from geomorphic studies appear in the literature describing the environment of the southern African Main Escarpment region adjacent to the Lesotho Highlands during the cold phases of the Late Quaternary. Evidence cites limited glaciation and/or periglacial conditions with or without permafrost. The thesis emphasises debates and presents arguments for alternative interpretation of landforms previously described in the literature as indicative of specific cold environments. Field investigations into the distribution and characteristics of openwork accumulations in southern Africa show that blocky accumulations are found within a range of climatic conditions, including arid and semi-arid environments. Mode of emplacement is highlighted as the critical factor in association with a periglacial environment. Relict openwork block accumulations in the Lesotho highlands area around Thabana Ntlenyana, the highest summit in the escarpment range, supports the contention for a relatively arid periglacial environment during the Late Pleistocene. Findings militate against either deep snow cover or localised glaciation of insolation-protected south-facing slopes. The evidence for periglacial conditions is supported by the presence of relict sorted patterns that indicate deep seasonal freeze. Contemporary soil temperature monitoring indicates a near-surface current seasonal freeze of two and a half months which would have been prolonged and deepened under depressed temperature. No specific evidence for periglacial conditions is found for the escarpment region in the Amatola mountains. Geography, Geoinformatics and Meteorology PhD Unrestricted 2021-11-02T10:19:46Z 2021-11-02T10:19:46Z 2021 2003 Thesis * http://hdl.handle.net/2263/82501 © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD geomorphic evidence On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa |
| title | On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa |
| title_full | On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa |
| title_fullStr | On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa |
| title_full_unstemmed | On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa |
| title_short | On the geomorphic evidence for a Late Quaternary periglaciation of the main escarpment region of eastern southern Africa |
| title_sort | on the geomorphic evidence for a late quaternary periglaciation of the main escarpment region of eastern southern africa |
| topic | UCTD geomorphic evidence |
| url | http://hdl.handle.net/2263/82501 |