Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumWest, Newman & Company for the trustees of the Museum, 1991 - Natural history |
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Page 9
... Pyritic trace - free mudrocks may have been deposited in biologi- cally sterile parts of the epeiric sea . CONTENTS PAGE Introduction ... 10 Location and general geology . Vertical facies changes and depositional model .. Age and ...
... Pyritic trace - free mudrocks may have been deposited in biologi- cally sterile parts of the epeiric sea . CONTENTS PAGE Introduction ... 10 Location and general geology . Vertical facies changes and depositional model .. Age and ...
Page 11
... pyritic silt - streaked muds deposited in a low - energy , anoxic , hypersaline environment beyond tidal reach INNER SHELF MUD AND SAND small tidal megripple fields colonized by sediment - dwelling organisms . Muddy anoxic where tide ...
... pyritic silt - streaked muds deposited in a low - energy , anoxic , hypersaline environment beyond tidal reach INNER SHELF MUD AND SAND small tidal megripple fields colonized by sediment - dwelling organisms . Muddy anoxic where tide ...
Page 14
... pyritic sand and circular to flattened - oval in cross - section ( Fig . 4 ) , occur in close stratigraphic proximity to beds permeated by large vertical Ophiomorpha- type burrows . These burrows often show repeated branching ( Fig . 5 ) ...
... pyritic sand and circular to flattened - oval in cross - section ( Fig . 4 ) , occur in close stratigraphic proximity to beds permeated by large vertical Ophiomorpha- type burrows . These burrows often show repeated branching ( Fig . 5 ) ...
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Common terms and phrases
abbreviated bioturbated burrow fill callianassid decapods Cape Town Chondrites cm Fig cm in diameter colonization by sediment-dwellers correlation cross-section Cruziana ichnofacies model currents and waves decapods depositional environment Description Differential weathering Diplocraterion disseminated pyrite EARLY ORDOVICIAN SARDINIA Ekdale epeiric sea FACIES INTERPRETATIONS Fascifodina Figure Frey & Pemberton Gastropoda Häntzschel 1975 holotype ichno ichnogenus indicate INNER SHELF MEGARIPPLE INNER SHELF MUD INNERMOST SHELF MUD interval Irregular U-tubes Leda MUD AND SAND Mudrock units namacolus occur Ophiomorpha paper paratypes parentheses Pemberton 1984 Port Elizabeth punctuation quartzite references relict sedimentary structures Restricted biota rocks Roman numerals sandstone sole Sardinia Bay Formation scientific name sediment sediment-dwelling organisms sedimentary structures Seilacher 1967 shafts shallow marine Shone shoreface Skolithos ichnofacies Skolithos tubes sole marking SOUTH AFRICAN MUSEUM Spreiten demarcated sub-horizontal Synonymy Table Mountain Group Thalassinoides tidal currents trace fossil assemblages trace fossil association traces resembling Upper Sardinia Bay V-shaped pattern Vermiform sand-filled tubes vertical burrows