Clays derived from the Lower Dwyka Shales, occurring in the vicinity of Grahamstown

Blignaut, J.J.G. (1928) Clays derived from the Lower Dwyka Shales, occurring in the vicinity of Grahamstown. Masters thesis, Rhodes University College.

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The Lower Dwyka Shales in South Africa oocur south of latitude 32⁰; resting conformably upon the Witteberg quartzites, which extend as coastal mountain rangee along the length of the South Coast. The shales, being less resistant to weathering than the quartzites below, and the Dwyka Tillite immediately above, are consequently found in valleys between these two formations. In one of these valleys Grahamstown is situated; where the Lower Dwyka Shales have been eroded by the various rivulets forming the eource of the Blaauwkrantz River. A geological map of the country round Grahamstown was prepared in eome detail, showing all the various rock formations occurring in the area, the full extent of the Lower Dwyka Shales being mapped with the Dwyka Tillite and the Witteberg Quartzite along its margins. The map includes an area of about six miles by three, with the Cathedral spire occupying an approximately central position, and is prepared on a scale of 5.65 inches to one mile. Traversing was done by means of prismatic compass and pacing.

Item Type:Thesis (Masters)
Additional Information:The Rhodes University College was established in 1904. The Rhodes University Private Bill was passed by Parliament in April 1949, which marks the date of independent accreditation of Rhodes as a University. Before that date Rhodes operated as a constituent college of the University of South Africa. All degree certificates issued during the period 1904-1950 were issued by the University of the Cape of Good Hope/University of South Africa. Unisa owes the copyright of all Rhodes theses up to 1950. Rhodes University Library received permission from Unisa's Vice Principal: Research and Innovation, to have access to these theses for the purpose of digitisation and it can be kept in the Rhodes University Institutional Repository.
Uncontrolled Keywords:Clay, Lower Dwyka Shales, Grahamstown, South Africa, Witteberg quartzites, Dwyka tillite, Geological map, Rock formations, Topography, Chemical properties, Physical properties, Economic prospects, Ceramic industry
Subjects:Q Science > QE Geology
Divisions:Faculty > Faculty of Science > Geology
ID Code:4228
Deposited By: Philip Clarke
Deposited On:11 Dec 2012 12:11
Last Modified:11 Dec 2012 12:11
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