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
... burrows with dark pyritic linings occur as endichnial traces in several sandstone horizons . Differential weathering of the lining temporarily exposes the burrow - fill in bas - relief , but eventually both burrow lining and fill are ...
... burrows with dark pyritic linings occur as endichnial traces in several sandstone horizons . Differential weathering of the lining temporarily exposes the burrow - fill in bas - relief , but eventually both burrow lining and fill are ...
Page 14
... burrows . These burrows often show repeated branching ( Fig . 5 ) . Burrow diameters range from 2 to 10 cm and individual shaft sections are up to 50 cm long . Inclined shafts may run parallel to foreset surfaces in the cross - bedded ...
... burrows . These burrows often show repeated branching ( Fig . 5 ) . Burrow diameters range from 2 to 10 cm and individual shaft sections are up to 50 cm long . Inclined shafts may run parallel to foreset surfaces in the cross - bedded ...
Page 18
... burrows from the Sardinia Bay Formation could also be the result of interfering Chondrites burrows , but apparently lack the repeated branching characteristic of Chondrites . Fascifodina has been interpreted variously as the grasping ...
... burrows from the Sardinia Bay Formation could also be the result of interfering Chondrites burrows , but apparently lack the repeated branching characteristic of Chondrites . Fascifodina has been interpreted variously as the grasping ...
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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