Note on the geology of a portion of the Klerksdorf District (1905)

"Note on the geology of a portion of the Klerksdorf District, with special reference to the development of the Lower Witwatersrand Beds and the Vaal River system. [From the Transactions of the Geological Society of South Africa, Vol. VIII, Pages 16-25, 1905.]"; Paperback; 10 pages; Some usual yellowing, ex-owner stamps, top right corner little smudged, right side folded (circa 1,5 cm). Good condition overall.

With paper visit card by the author ("With the compliments of Dr. G.A.F. Molungraaff, P.O. Box 149, Johannesburg").

List of plates:

1) Plate IV - Geological Map of a portion of The Klerksdorf District

2) Plate V:

- I. Section through farm Rhenosterspruit

- II. Section through the farms Syferfontein and Schietfontein

- III. Cleavage in Lower Witwatersrand Beds on Syferfontein No.504

- IV. Section through Dominion Reef Series in main incline shaft on Rhenosterspruit

- V. Section through Dominion Reef Series in southern shaft on Rhenosterspruit

- VI. Section through Dominion Reef Series in escarpment on Oorbietjesfontein

Gustaaf Adolf Frederik Molengraaff (27 February 1860 – 26 March 1942) was a Dutch geologist, biologist and explorer. He became an authority on the geology of South Africa and the Dutch East Indies.Gustaaf Molengraaff studied mathematics and physics at Leiden University. From 1882 he studied at Utrecht University.In 1888 Molengraaff took a job as a teacher at the University of Amsterdam. Before his assignment courses in geology were given by the chemist Jacobus Henricus van 't Hoff. During his assignment in Amsterdam, Molengraaff travelled to South Africa to study gold deposits (1891) and to Borneo (1894) where he explored large parts of the inland. Teaching at Amsterdam was not to his liking, because there were too little materials and students available.In 1897 Molengraaff became "state geologist" of the Transvaal Republic. His task was to start the geological survey of the Transvaal. While mapping the Transvaal he discovered the Bushveld complex. In 1900 he got involved in the Second Boer War and had to return to the Netherlands. This gave him time to write a report on the geology of the Transvaal, and travel to Celebes, where he (again) studied gold deposits.Due to his reputation as a geologist he could return to South Africa in 1901 to work as a geological consultant. One of his assignments was to describe the newly found Cullinan diamond for the Central Bank of South Africa. Meanwhile the Boer War still had his attention. One of his ideas was to give each soldier a small tin identity card, which later became practice in armies around the world.In 1906 he became professor at Delft University and this time he got enough resources and students to make his work successful. The same year he became member of the Royal Netherlands Academy of Arts and Sciences. In 1910-1911 he led a geological expedition to Timor. His research at Delft was mainly on the material collected during that expedition, and on the geology of the Netherlands. In 1927 he was a guide of the Shaler Memorial Expedition to South Africa, organized by Harvard University. On the expedition he met Alexander Du Toit, both geologists were among the (at that time rare) supporters of Alfred Wegeners' continental drift theory. (https://en.wikipedia.org/wiki/Gustaaf_Adolf_Frederik_Molengraaff)