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
... sandstone are tentatively identified as Cru- ziana . A number of enigmatic traces occur on bedding surfaces . Three trace fossil associations are recognized in the Sardinia Bay Formation . Two of these correspond broadly with the Cru ...
... sandstone are tentatively identified as Cru- ziana . A number of enigmatic traces occur on bedding surfaces . Three trace fossil associations are recognized in the Sardinia Bay Formation . Two of these correspond broadly with the Cru ...
Page 11
... Sandstone 150 Mudrock Planar cross - beds Low - angle sand wave erosion planes Trough cross- beds -100 Horizontal ... sandstones attributed to the migration of small megaripples in an inner - shelf depositional environment . Elsewhere ...
... Sandstone 150 Mudrock Planar cross - beds Low - angle sand wave erosion planes Trough cross- beds -100 Horizontal ... sandstones attributed to the migration of small megaripples in an inner - shelf depositional environment . Elsewhere ...
Page 18
... sandstone sole marking that consists of a series of raised elongate ridges in a V - shaped pattern . It is clear that the ridges on the sandstone sole are casts of a series of V - shaped grooves cut in an underlying muddy horizon , now ...
... sandstone sole marking that consists of a series of raised elongate ridges in a V - shaped pattern . It is clear that the ridges on the sandstone sole are casts of a series of V - shaped grooves cut in an underlying muddy horizon , now ...
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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