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
... Planolites .. 16 18 18 19 Ichnofacies models and depositional environments 20 The ichnofacies concept . 20 Skolithos ichnofacies 21 Cruziana ichnofacies 22 Trace fossil associations in the Sardinia Bay Formation . Acknowledgements 22 24 ...
... Planolites .. 16 18 18 19 Ichnofacies models and depositional environments 20 The ichnofacies concept . 20 Skolithos ichnofacies 21 Cruziana ichnofacies 22 Trace fossil associations in the Sardinia Bay Formation . Acknowledgements 22 24 ...
Page 21
... Planolites . Note that the burrow fill is almost indistinguishable from the substrate ; the burrow margins are revealed only by the effects of differential weathering . mind , however , that ichnofacies models are likely to be less ...
... Planolites . Note that the burrow fill is almost indistinguishable from the substrate ; the burrow margins are revealed only by the effects of differential weathering . mind , however , that ichnofacies models are likely to be less ...
Page 23
... Planolites traces , dissemi- nated pyrite ) appears to have been deposited in a zone of restricted circulation . Increasingly anoxic conditions in such quiet reaches of an epeiric sea would eventually prohibit colonization by sediment ...
... Planolites traces , dissemi- nated pyrite ) appears to have been deposited in a zone of restricted circulation . Increasingly anoxic conditions in such quiet reaches of an epeiric sea would eventually prohibit colonization by sediment ...
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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