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
... consists essentially of siltstone and shale with interbedded sandstones . Hiller & Dunlevey ( 1978 ) , working in the Touws River - Montagu area , subdivided that part of the stratigraphy straddling the Bokkeveld Group - Witteberg Group ...
... consists essentially of siltstone and shale with interbedded sandstones . Hiller & Dunlevey ( 1978 ) , working in the Touws River - Montagu area , subdivided that part of the stratigraphy straddling the Bokkeveld Group - Witteberg Group ...
Page 218
... consists of thick cross - bedded quartz arenites and thin carbonaceous shales . Plant fossils and trace fossils have been recorded . SEDIMENTARY FACIES In their summary of the depositional environments , Tankard et al . ( 1982 ) stated ...
... consists of thick cross - bedded quartz arenites and thin carbonaceous shales . Plant fossils and trace fossils have been recorded . SEDIMENTARY FACIES In their summary of the depositional environments , Tankard et al . ( 1982 ) stated ...
Page 220
... consists mostly of mature sandstones . In the basal 10-12 m these are brownish in colour , fine to medium grained , and display horizontal lamination and ripple cross - lamination . Above this level the sandstones are cleaner , slightly ...
... consists mostly of mature sandstones . In the basal 10-12 m these are brownish in colour , fine to medium grained , and display horizontal lamination and ripple cross - lamination . Above this level the sandstones are cleaner , slightly ...
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Common terms and phrases
abbreviated AFRICA articulate brachiopods barrier islands basal Witteberg beds benthic assemblages BENTHIC COMMUNITIES Blinkberg Formation Bokkeveld Group Boucot British Museum Natural carbonaceous shales Chonetes comma cross-bedded delta deposited Devonian rocks environmental External mould facies analysis Falkland Islands fauna 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 Orbiculoidea overlain paratypes parentheses pedicle valve Plectonotus sp punctuation quartz arenite unit registration number ripple cross-laminated sandstone Roman numerals salinity sandstones scientific name sediment SEDIMENTARY FACIES shoreline siltstone and shale Silurian and Devonian SOUTH AFRICAN MUSEUM specimens Spiriferid 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 vicinity of Touws volume number Wagen Drift Formation wash-over WELTEVREDE FORMATION Fig Western Cape yielded marine invertebrate