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
... sandstones . Hiller & Dunlevey ( 1978 ) , working in the Touws River - Montagu area , subdivided that part of the stratigraphy straddling the Bokkeveld Group - Witteberg Group boundary into three formations , of which the upper two were ...
... sandstones . Hiller & Dunlevey ( 1978 ) , working in the Touws River - Montagu area , subdivided that part of the stratigraphy straddling the Bokkeveld Group - Witteberg Group boundary into three formations , of which the upper two were ...
Page 218
... sandstones ( Fig . 4 ) . Load structures are a feature of several sandstone - shale contacts . This sequence is interpreted as the product of a prograding distributary mouth bar in a delta complex ( Wright 1978 ) . It is overlain by a ...
... sandstones ( Fig . 4 ) . Load structures are a feature of several sandstone - shale contacts . This sequence is interpreted as the product of a prograding distributary mouth bar in a delta complex ( Wright 1978 ) . It is overlain by a ...
Page 220
... sandstone units thin upwards and are overlain by vertical alternations of siltstone and shale in which flaser and ... sandstones are cleaner , slightly coarser grained , greyish quartz arenites displaying planar and trough cross ...
... sandstone units thin upwards and are overlain by vertical alternations of siltstone and shale in which flaser and ... sandstones are cleaner , slightly coarser grained , greyish quartz arenites displaying planar and trough cross ...
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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