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 12
... weathering of the lining temporarily exposes the burrow - fill in bas - relief , but eventually both burrow lining and fill are excavated leaving the bedding surface crowded with perpendicular holes ( Fig . 3 ) . These weathered - out ...
... weathering of the lining temporarily exposes the burrow - fill in bas - relief , but eventually both burrow lining and fill are excavated leaving the bedding surface crowded with perpendicular holes ( Fig . 3 ) . These weathered - out ...
Page 13
... weathering of the less resistant burrow- fill and lining results in a bedding surface crowded with holes perpendicular to bedding . 5 cm . Scale = Interpretation These vertical burrows are broadly similar to Ophiomorpha but lack the ...
... weathering of the less resistant burrow- fill and lining results in a bedding surface crowded with holes perpendicular to bedding . 5 cm . Scale = Interpretation These vertical burrows are broadly similar to Ophiomorpha but lack the ...
Page 21
... Weathered surface of a mudrock unit showing disseminated pyrite now altered to lim- onite ( dark nodules ) and short ... weathering . mind , however , that ichnofacies models are likely to be less reliable in dealing with ancient ...
... Weathered surface of a mudrock unit showing disseminated pyrite now altered to lim- onite ( dark nodules ) and short ... weathering . mind , however , that ichnofacies models are likely to be less reliable in dealing with ancient ...
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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