In the paper, " Tertiary-Age Diamondiferous Fluvial Deposits of the Lower Orange River Valley, Southwestern Africa," by R.J. Jacob, B.J. Bluck, and J.D. Ward (Vol. 94, issue 4, 1999, p. 749), errors with reference to age were made in the Abstract. Corrected sentences are below; line numbers indicate where each of the two sentences begins.
Paragraph 1, line 9: The earliest (proto-) Orange River terraces, richer in diamonds than the younger, intermediate (meso-) Orange River deposits, form low-grade but large-average, diamond- size, gem quality placers which are mainly discussed here.
Paragraph 4, line 1: Although the vertical decline in diamond...
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