Stromatolitic associations and their palaeo-environmental significance: A re-appraisal of a lower proterozoic locality from the northern cape province, South Africa

摘要: Abstract A basal section of the Lower Proterozoic Transvaal Dolomite from northern Cape has been re-examined. Numerous associations stromatolites and other structures have distinguished in it. Forms domical stromatolite dominate structures, but columns, built around spheroidal forms, are also represented. This material accumulated a telescoped range environments through intertidal to high-energy agitated zone out into subtidal. Columnar forms flat domes appear be remarkably similar features described Hamelin Pool at Shark Bay, Western Australia. The subtidal elongate mounds increase size with depth reach dimensions 40 by 10 m, heights 13 m relief 2.5 m. Minor on these reflect decreasing energy outwards; included within them columnar shallow zone. It is suggested that deposition an epeiric sea was away headland relatively steeply shelving floor affected currents right angles shore. There indications arid semi-arid climate existed time.