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The Timeball Hill Formation--A Fossil Delta
K. A. Eriksson
The Timeball Hill Formation of the Transvaal Supergroup is composed of quartzite and carbonaceous and finely-laminated ferruginous shale. In the northern parts of the Potchefstroom Synclinorium thick quartzites are characteristic but the percentage of this rock-type decreases southwards so that lenticular quartzites are developed around the northern flanks of the Vredefort Dome. Concomitant with these changes, shallow water carbonaceous and deeper water finely-laminated shales occur on the northern limb of the synclinorium while only the latter shale-type is found in association with the lenticular quartzites to the south.
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