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eWISA
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VERLOREVLEI:
MAIN INDEX |
ALPHABETICAL
LIST OF RIVERS |
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Map
of the VERLOREVLEI River |
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TOPOGRAPHY
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The catchment is bounded by the Swartberg
and Olifantsrivierberge in the east and by the Piketberg in the south,
and includes the Eendekuil basin, a low-lying area lying between the
Olifantsrivierberge and the Piketberg.
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GEOLOGY
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The Malmesbury
Group (Proterozoic) has been subdivided on purely lithological
grounds into three groups, calcareous, quartzose and phyllite with
greywacke. The calcareous group comprises pure limestone, dolomitic
limestone and dolomite. Carbonaceous patches and calcareous rocks grade
into quartz-rich varieties.(Ref 1)
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The
Klipheuwel Formation
(Proterozoic) comprises the following: purple to red-dish brown sandy
micaceous shale which is mostly poorly-bedded and grades into mudstone;
alternating beds of sandstone, shaly sandstone and sandy shale with
colours ranging from buff to purple and red; white and brightly coloured
sandstone and grit with minor conglomerate and shale layers. The
arencaeous strata are commonly cross-bedded, quite often feldspathic,
and much softer than the Table Mountain Group sandstone. The maximum
thickness exposed on the eastern boundary of this area amounts to about
375m. (Ref 1)
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White to
slightly-reddish sandy soil originated mainly from the underlying
unconsolidated to partly-consolidated sand and clay, and to a lesser
extent from the Table Mountain
Group, the coastal dunes, and fluviatile deposits of past and
present drainage systems.
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SOILS
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Von
Harmse (Ref. 3), in his Schematic Soil Map of Southern Africa (1978),
classifies the Verlorenvlei area as a zone of littoral sands which are
arenosols, or of aeolian origin. He points out that the salient feature
of such soils is their low reserve of weatherable minerals, and the low
silt/clay ratio. Taylor (1987) describes these coastal lowlands as
consisting of sands and conglomerates of Tertiary to Recent origins. He
comments on their low water-retaining capacity, being either acid and
relatively infertile or, nearer the coast, alkaline with a distinct
horizon of lime accumulation. The 'heuweltjies' or hillocks have higher
clay content than the surrounding soils (Ref1)
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References |
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Ref 1: Estuaries of the Cape: Report
32 VERLORENVLE(CW 13)CSIR RESEARCH REPORT 431
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Useful
links |
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