. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 16 ANNALS OF THE SOUTH AFRICAN MUSEUM. Ml:J ^J»~\ U-tube Fig. 7. Photograph (top) and tracing (bottom) showing an irregular U-tube with spreiten in a bioturbated sandstone. Interpretation These are probably Skolithos tubes (Upper Precambrian-Lower Creta- ceous), usually attributed to the activities of marine worms but of uncertain origin (Hantzschel 1975: W108). Skolithos tubes are widespread in other Table Moun- tain Group outcrops (Rust 1967, 1973, 1977; Cocks et al. 1970: 603). THIN VERMIFORM SAND
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 16 ANNALS OF THE SOUTH AFRICAN MUSEUM. Ml:J ^J»~\ U-tube Fig. 7. Photograph (top) and tracing (bottom) showing an irregular U-tube with spreiten in a bioturbated sandstone. Interpretation These are probably Skolithos tubes (Upper Precambrian-Lower Creta- ceous), usually attributed to the activities of marine worms but of uncertain origin (Hantzschel 1975: W108). Skolithos tubes are widespread in other Table Moun- tain Group outcrops (Rust 1967, 1973, 1977; Cocks et al. 1970: 603). THIN 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 Upper Sardinia Bay Formation. Individual tubes tend to straighten and become sub-vertical upwards. Interpretation The vermiform traces described above resemble lower parts of the ichno- genus Fascifodina, the upper parts of which, including the master-shaft, have been removed by erosion (cf. Hantzschel 1975: W63, fig. 3). Fascifodina is,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
