Annals of the South African Museum, Volume 101, Issue 2 |
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Page 12
OPHIOMORPHA Description Large sub - cylindrical sand - filled vertical 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 ...
OPHIOMORPHA Description Large sub - cylindrical sand - filled vertical 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 ...
Page 14
Description Smooth - walled sand - filled sub - horizontal to inclined burrows ,
with a lining of dark pyritic sand and circular to flattened - oval in cross - section (
Fig . 4 ) , occur in close stratigraphic proximity to beds permeated by large vertical
...
Description Smooth - walled sand - filled sub - horizontal to inclined burrows ,
with a lining of dark pyritic sand and circular to flattened - oval in cross - section (
Fig . 4 ) , occur in close stratigraphic proximity to beds permeated by large vertical
...
Page 18
The vermiform burrows from the Sardinia Bay Formation could also be the result
of interfering Chondrites burrows , but ... interpreted variously as the grasping
traces of nautiloid tentacles ( Flower 1955 ) or as a feeding burrow ( Osgood
1970 ) ...
The vermiform burrows from the Sardinia Bay Formation could also be the result
of interfering Chondrites burrows , but ... interpreted variously as the grasping
traces of nautiloid tentacles ( Flower 1955 ) or as a feeding burrow ( Osgood
1970 ) ...
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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