Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumWest, Newman & Company for the trustees of the Museum, 1990 - Natural history |
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Page 217
... comprises micaceous pale grey to white mudstones and thin , medium - grained sandstones , with red siltstone becoming more common towards the top of the unit . In the middle is a thin , cross - bedded , quartz arenite with Zoophycos ...
... comprises micaceous pale grey to white mudstones and thin , medium - grained sandstones , with red siltstone becoming more common towards the top of the unit . In the middle is a thin , cross - bedded , quartz arenite with Zoophycos ...
Page 218
... comprising siltstone and shale with thin sandstone interbeds , and containing plant fossils and Zoophycos traces . The top of the Weltevrede Subgroup is occupied by the Witpoort Formation , a thick sequence of white - weathering quartz ...
... comprising siltstone and shale with thin sandstone interbeds , and containing plant fossils and Zoophycos traces . The top of the Weltevrede Subgroup is occupied by the Witpoort Formation , a thick sequence of white - weathering quartz ...
Page 220
... comprise quartz arenites , siltstones and shales arranged in a number of upward - fining cycles ( Fig . 5 ) . The sandstone units thin upwards and are overlain by vertical alternations of siltstone and shale in which flaser and ...
... comprise quartz arenites , siltstones and shales arranged in a number of upward - fining cycles ( Fig . 5 ) . The sandstone units thin upwards and are overlain by vertical alternations of siltstone and shale in which flaser and ...
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Common terms and phrases
abbreviated AFRICA articulate brachiopods barrier islands benthic assemblages BENTHIC COMMUNITIES bicuspidata Gould bivalves bivalves and possible Blinkberg Formation Bokkeveld Group Boucot British Museum Natural carbonaceous shales Chonetes Chonetid Community comma cross-bedded deeper-water subtidal conditions delta deposited Devonian rocks environmental External mould facies analysis Falkland Islands fauna Formation near Touws Frasnian gastropod genus Givetian Grahamstown high-diversity holotype homalonotid trilobite horizontal lamination Howison's Poort inarticulate infaunal interpreted Leda Lingula lepta LOWER WITTEBERG GROUP Museum Natural History namacolus Orbiculoidea overlain paratypes parentheses pedicle valve punctuation salinity sandstones scientific name sediment SEDIMENTARY FACIES shoreline shouldered italics siltstone and shale Silurian and Devonian SOUTH AFRICAN MUSEUM specimens Spiriferid Community Stratigraphic subheadings are shouldered suspension feeders SWARTRUGGENS FORMATION Synonymy Tankard & Barwis taxa Theron thin tidal tidal-flat Touws River trace fossils Trigonoglossa Tropidoleptus sp Upper Devonian upward-fining cycles Wagen Drift Formation wash-over Weltevrede Formation Western Cape Witpoort Formation yielded marine invertebrate