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Browsing by Author "Vogel, JC"

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Preliminary report of samples of No. 4 seam from borehole cores put down on Klipplaat 47, Tweefontein 69 and Waterpan 68 by Tweefontein United Collieries Limited

Author: Vogel, JC Date: 1937 Samples of No. 4 seam were obtained from seven boreholes. The cores were, in part, broken and incomplete. Read more
Preliminary results of excavations at Lincoln Cave, Sterkfontein, South Africa

Author: Reynolds, SC ; Vogel, JC ; Clarke, RJ ; Kuman, KA Date: May 2003 Recent excavations of undisturbed deposits within the Lincoln Cave, Sterkfontein, have conclusively demonstrated that at least one of the deposits is mid-late Pleistocene in age. The artefacts recovered from this excavation are in a datable ... Read more
Radiocarbon adjustments to the dendrochronology of a yellowwood tree

Author: Vogel, JC ; Fuls, A ; Visser, E Date: Mar 2001 High-precision radiocarbon dating of a millennium-old yellowwood tree from the Midlands of Natal shows that the tree-rings do, in general, record annual growth, but that both missing and false rings occur. At two places along the transect of ... Read more
Radiocarbon-dates of snow petrel regurgitations can reveal exposure periods for nunataks in Antarctica

Author: Ryan, PG ; Steele, WK ; Siegfried, WR ; Vogel, JC Date: Nov 1992 There are several problems associated with determining radiocarbon dates, particularly for organic material from Antarctica. However, this study attempts to find accurate measure of the length of time these radiocarbon dates have been established ... Read more
Radiometric date for the Port Durnford peat and development of yellow-wood forest along the South African east coast

Author: Oschadleus, HD ; Vogel, JC ; Scott, L Date: Jan 1996 The age of the peat, or 'lignite', layer in the Port Durnford Formation on the Zululand coast has been established to be about 70 kyr by means of the Th-230/U-234 disequilibrium dating technique. This date places the pent temporally at the ... Read more
The reduction in ash content of some South African Coals

Author: Vogel, JC Date: 1938 The high capital cost of coal hydrogenation plant makes it essential that oil output be maintained at high level as possible as this factor must primarily govern the choice of the coal to be used or the decision as to whether as coal is ... Read more
Secular variations in carbon-14 and their geophysical implications

Author: Vogel, JC Date: Mar 2002 Cosmic ray production of the radioactive carbon isotope C-14, which is the basis for the radiocarbon dating method, has not remained constant over time. The result is that radiocarbon dates show significant deviations from the true age. The ... Read more
Suitability of Ostrich eggshell for radiocarbon dating

Author: Vogel, JC ; Visser, E ; Fuls, A Date: 2001 Ostrich eggshell from archaeological sites remains largely free of more recent carbon contamination and as such is suitable material for radiocarbon dating. The carbonate fraction of the shell does, however, display an initial deficit in C14, ... Read more

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Browsing by Author "Vogel, JC"

Browsing by Author "Vogel, JC"

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