Annals of the South African Museum, Volume 101, Issue 2 |
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Page 12
Even so , individual traces can seldom be named with confidence and some of
the trace fossils could represent hitherto undescribed forms . In certain instances ,
trace fossils in the Sardinia Bay Formation exceed the time ranges known for ...
Even so , individual traces can seldom be named with confidence and some of
the trace fossils could represent hitherto undescribed forms . In certain instances ,
trace fossils in the Sardinia Bay Formation exceed the time ranges known for ...
Page 14
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 sandstone . Interpretation The sub - horizontal branching burrow systems
...
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 sandstone . Interpretation The sub - horizontal branching burrow systems
...
Page 16
Individual tubes tend to straighten and become sub - vertical upwards .
Interpretation The vermiform traces described above resemble lower parts of the
ichnogenus Fascifodina , the upper parts of which , including the master - shaft ,
have ...
Individual tubes tend to straighten and become sub - vertical upwards .
Interpretation The vermiform traces described above resemble lower parts of the
ichnogenus Fascifodina , the upper parts of which , including the master - shaft ,
have ...
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Common terms and phrases
abbreviated animals anoxic appear areas author's name authors base bedding surface bioturbated branching burrows Cape capital Chondrites circulation cm Fig colonization contain correlation Cruziana Cruziana ichnofacies model dark pyritic deposited depositional environment described Description designated diameter Diplocraterion energy environment epeiric sea example facies Fascifodina Figure follow formed Frey & Pemberton Häntzschel 1975 horizontal hypersaline conditions illustrations indicate individual Interpretation interval italics known letters lining marking MUD AND SAND mudrock Note occur Ophiomorpha organisms origin parentheses Pemberton 1984 Photograph Planolites possible probably punctuation pyritic range reduction references represent resemble response restricted rocks rounded SAND sand-filled tubes sandstone Sardinia Bay Formation sediment sediment-dwelling sedimentary structures separates shafts Shone showing similar Skolithos Skolithos ichnofacies Smith SOUTH AFRICAN MUSEUM species Spreiten strata substrate suggest Table Table Mountain Group Thalassinoides tidal currents trace fossil association typical U-tube units Upper vermiform vertical wave weathering