Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum |
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Page 216
... possibly bivalve impressions , along with trace fossils , in rocks of the lower
Witteberg Group in the Willowmore district . ... possible to recognize any of the
benthic communities that have been described from Silurian and Devonian rocks
from ...
... possibly bivalve impressions , along with trace fossils , in rocks of the lower
Witteberg Group in the Willowmore district . ... possible to recognize any of the
benthic communities that have been described from Silurian and Devonian rocks
from ...
Page 225
Such a life - style would mean that it could turn up in almost any shallow marine
habitat but the association of orbiculoid and linguloid brachiopods is a common
one in many Silurian and Devonian rocks of nearshore origin ( Boucot 1975 ) .
Such a life - style would mean that it could turn up in almost any shallow marine
habitat but the association of orbiculoid and linguloid brachiopods is a common
one in many Silurian and Devonian rocks of nearshore origin ( Boucot 1975 ) .
Page 228
AGE The general lack of fossils in the Witteberg Group has made dating of the
rocks rather difficult . ... Stapleton ( 1977a , 1977b ) used spores from the same
horizon to determine a Middle or Upper Devonian ( Givetian - Frasnian ) age .
AGE The general lack of fossils in the Witteberg Group has made dating of the
rocks rather difficult . ... Stapleton ( 1977a , 1977b ) used spores from the same
horizon to determine a Middle or Upper Devonian ( Givetian - Frasnian ) age .
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Common terms and phrases
abbreviated according AFRICA articulate brachiopods association author's name authors basal bedding benthic assemblages BENTHIC COMMUNITIES bivalves Blinkberg Bokkeveld Group Boucot capital collected communities consists containing cycles delta deposited described Devonian Devonian rocks differences DISTRIBUTARY diversity dominated Eastern environment environmental fauna figures gastropod homalonotid Howison's Poort illustrations inarticulate indicate infaunal interpreted intertidal Islands italics known letters Lingula localities lower major marine marine invertebrates mark Member Middle mould Museum Natural History nearshore Note occur original parentheses placed plant fossils Plectonotus punctuation quartz arenites range recorded references represent reworking salinity sandstones scientific sediment SEDIMENTARY FACIES separates sequence shales shallow siltstone similar Smith South African species specimens Stratigraphic subtidal suggest Tables Tankard thick thin Touws River trace fossils trilobite unit upper valve Wagen Drift Formation Weltevrede Formation Western Cape Witpoort Formation Witteberg Group yielded Zoophycos