JMDMT #2089 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - sequence: Rooiberg "felsite" Group; gabbroic Rustenburg Layered Suite, RLS; Lebowa Granite Suite, LGS; maximum cumulative thickness ~15 km). Most RLS and LGS spread as sills beneath Rooiberg "felsite"; local "felsite" slivers are preserved beneath or between RLS sills [3]. Interiors of Bushveld basins are obscured by LGS or post-Bushveld cover, except for 50-km areas of pre-Bushveld rocks within the two southern basins. Each consists of a pair of contrasting "fragments" in fault contact, one intensely deformed, the other relatively undeformed. RLS does not extend far into the basins [4]. Consequently, undeformed Rooiberg "felsite" rests on the pre-Bushveld Pretoria Group in undeformed "fragments." The Pretoria and Rooiberg Groups bracket the catastrophe.