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1. The record of impact processes on the early Earth: A review of the first 2.5 billion years....... 1 Christian Koeberl 2. Large-scale impacts and the evolution of the Earth's crust: The early years ................ 23 Richard A.F. Grieve, Mark J. Cintala, and Ann M. Therriault 3. Archean spherule layers in the Barberton greenstone belt, South Africa: A discussion of problems related to the impact interpretation ............................ 33 Axel Hofmann, Wolf Uwe Reimold, and Christian Koeberl 4. Diagenetic alteration of impact spherules in the Neoarchean Monteville layer, South Africa .......................... ...... ....... .. ....................... 57 Issaku Kohl, Bruce M. Simonson, and Melissa Berke 5. Relicts of Earth's earliest crust: U-Pb, Lu-Hf, and morphological characteristics of>3.7 Ga detrital zircon of the western Canadian Shield............................... 75 R.P. Hartlaub, L.M. Heaman, A. Simonetti, and C.O. Bohm 6. Precise U-Pb Zircon ID-TIMS ages provide an alternative interpretation to early ion microprobe ages and new insights into Archean crustal processes, northern Labrador ....... 91 Thomas E:'Krogh and Sandra L. Kamo 7. The 3.466 Ga "Kitty's Gap Chert," an Early Archean microbial ecosystem ................ 105 Frances Westall, Sjoukje T. de Vries, Wouter Nijman, Virgile Rouchon, Beate Orberger, Victoria Pearson, Jon Watson, Alexander Verchovsky, lan Wright, Jean-No1e Rouzaud, Daniele Marchesini, and Anne Severine 8. Microfacies and origin of some Archean cherts (Pilbara, Australia) ..................... 133 Beate Orberger, Virgile Rouchon, Frances Westall, Sjoukje T. de Vries, Daniele L. Pinti, Christiane Wagner, Richard Wirth, and Ko Hashizume 9. Contrasting source components of clastic metasedimentary rocks in the lowermost formations of the Barberton greenstone belt............... ...................... 157 Annika Dziggel, Gary Stevens, Marc Poujol, and Richard A. Armstrong 10. The significance of subduction-related accretionary complexes in early Earth processes..... 173 John W. Shervais 11. A reevaluation ofArchean intracratonic terrane boundaries on the Kaapvaal Craton, South Africa: Collisional suture zones? .......... ............................... 193 Carl R. Anhaeusser 12. Syntectonic emplacement and deformation of the Heerenveen batholith: Conjectures on the structural setting of the 3.1 Ga granite magmatism in the Barberton granite-greenstone terrain, South Africa ............................ 211 Richard W. Belcher and Alexander F.M. Kisters 13. SHRIMP zircon age constraints on Mesoarchean crustal development in the Vredefort dome, central Kaapvaal Craton, South Africa ............................... 233 Richard A. Armstrong, Cristiano Lana, Wolf Uwe Reimold, and Roger L. Gibson 14. Physical volcanology and compositions of the basaltic lavas in the Archean Nzuse Group, White Mfolozi inlier, South Africa................................... 255 Allan H. Wilson and Claire E. Grant 15. The structural-metamorphic evolution of the northern margin of the Zimbabwe Craton and the adjacent Zambezi belt in northeastern Zimbabwe ....................... 291 Paul H.G.M. Dirks and Hielke A. Jelsma 16. The Limpopo Belt: A result ofArchean to Proterozoic, Turkic-type orogenesis? ............ 315 J.M. Barton Jr., R. Klemd, and A. Zeh 17. Origin of hydrothermal fluids and gold mineralization associated with the Ventersdorp Contact Reef, Witwatersrand Basin, South Africa: Constraints from S, 0, and H isotopes .................................... ......... 333 B. Zhao, L.J. Robb, C. Harris and L.J. Jordaan 18. The nature of hydrocarbons and related fluids in the Witwatersrand Basin, South Africa: Their role in metal redistribution.................................... 353 G.R. Drennan and L.J. Robb 19. Conditions of gold remobilization in the Ventersdorp Contact Reef, Witwatersrand Basin, South Africa........... .. .................................. 387 Rudy H. Boer and Wolf Uwe Reimold