Dec. 7, 1971 Bushmanland syenite 3130 m.y. + 30 onverwacht lava 3550 + 30 m.y. Dated by Oothuizen (Chief of Mr. Wilson) Gert Smuts "New Lead Isotopic Ages for Minerals in Granitic Rocks Northern+ Central Transvaal" - by A.J. Burger, E.J. Oothuizen + C.B. Van Nickerk Dept of Mines - Pret S.A. Ann. of th. Geol. Surv., Vol 6 - 1967 (Govt Printer - Bosman St, Pretoria) Nelspruit Granite is according to Woestie older than folding of Barberton mts. "T. Geochronology of a suite of Rocks fr. t. Granitic Terrain surrounding the Barberton Mt. Land " E.J. Oothuizen 1970 PhD Thesis, Univ. of Witwatersrand Johburg. H.L Allsopp + John Ferguson - Wits Univ. "Measurements relating to genesis of t. Tsuneb Pipe, S.W.A." Earth & Planetary Sci Letters 9 (1970) 448 - 453, North-Holland Publishing Co, At Univ. of Wits weekend M.S' Heidi Anderson - Maltino beds PHD Anna Benekse - Brakfont + Lange Riviers. Telephone conversation 12/7/71 Oothuizen - says at base of Onverwacht lava is a quartzite C/O Nat'l Institute of Metallurgy Private Bag 6 Cottesloe, Johannesburg