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 216
... basal unit of the Witteberg Group in the vicinity of Touws River . Theron ( 1970 , 1972 ) , who had also collected in the Touws River area , used brachiopods and a trilobite as a basis for assigning a Lower to Middle Devonian or ...
... basal unit of the Witteberg Group in the vicinity of Touws River . Theron ( 1970 , 1972 ) , who had also collected in the Touws River area , used brachiopods and a trilobite as a basis for assigning a Lower to Middle Devonian or ...
Page 220
... 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 coarser grained , greyish quartz arenites ...
... 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 coarser grained , greyish quartz arenites ...
Page 222
... basal Witteberg beds are part of a regressive cycle that follows directly on from similar cycles in the Bokkeveld Group . Tankard et al . ( 1982 ) indicated that the Wagen Drift Formation represents the subaqueous portion of a delta and ...
... basal Witteberg beds are part of a regressive cycle that follows directly on from similar cycles in the Bokkeveld Group . Tankard et al . ( 1982 ) indicated that the Wagen Drift Formation represents the subaqueous portion of a delta 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