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. 2000 Feb 15;97(4):1400–1405. doi: 10.1073/pnas.97.4.1400

Figure 1.

Figure 1

Stratigraphy of the Transvaal supergroup of southern Africa in the Griquitown West area, showing the relationships between the Mn-bearing units of the Hotazel Formation and the underlying volcanics and glacial sediments.