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
... vermiform sand - filled tubes ? Cruziana .. Horizontal traces on upper bedding surfaces . Planolites .. 16 18 18 19 Ichnofacies models and depositional environments 20 The ichnofacies concept . 20 Skolithos ichnofacies 21 Cruziana ...
... vermiform sand - filled tubes ? Cruziana .. Horizontal traces on upper bedding surfaces . Planolites .. 16 18 18 19 Ichnofacies models and depositional environments 20 The ichnofacies concept . 20 Skolithos ichnofacies 21 Cruziana ...
Page 16
... VERMIFORM SAND - FILLED TUBES Description Vermiform sand - filled tubes , up to 1 cm in diameter and oval to circular in cross - section , occur in spaghetti - like masses towards the bases of thin sandstone beds ( Fig . 9 ) in the ...
... VERMIFORM SAND - FILLED TUBES Description Vermiform sand - filled tubes , up to 1 cm in diameter and oval to circular in cross - section , occur in spaghetti - like masses towards the bases of thin sandstone beds ( Fig . 9 ) in the ...
Page 18
... vermiform epireliefs ( Häntzschel 1975 ) . The vermiform burrows from the Sardinia Bay Formation could also be the result of interfering Chondrites burrows , but apparently lack the repeated branching characteristic of Chondrites ...
... vermiform epireliefs ( Häntzschel 1975 ) . The vermiform burrows from the Sardinia Bay Formation could also be the result of interfering Chondrites burrows , but apparently lack the repeated branching characteristic of Chondrites ...
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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