. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 20 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 11. Photograph (left) and tracing (right) showing thin horizontal sand-filled burrows and rounded cross-sections of vertical sand-filled tubes on a sandstone bedding surface. These traces are similar to Chondrites. probably worms (Nicholson 1873; Hantzschel 1975: W95-W97). The indistinct walls suggest the host sediment and burrow-fill were identical in composition and that the burrowing activities may have taken place in a soupy mud (cf. Ekdale^fl/. 1984: 2
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 20 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 11. Photograph (left) and tracing (right) showing thin horizontal sand-filled burrows and rounded cross-sections of vertical sand-filled tubes on a sandstone bedding surface. These traces are similar to Chondrites. probably worms (Nicholson 1873; Hantzschel 1975: W95-W97). The indistinct walls suggest the host sediment and burrow-fill were identical in composition and that the burrowing activities may have taken place in a soupy mud (cf. Ekdale^fl/. 1984: 219). ICHNOFACIES MODELS AND DEPOSITIONAL ENVIRONMENT THE ICHNOFACIES CONCEPT Trace fossil assemblages are often associated with particular depositional environments. Seilacher (1967) attempted to correlate trace fossil assemblages with water depth, but it is now clear that other factors (sediment composition and texture, temperature, light penetration, salinity, oxygenation, food supply, hydraulic energy, and sedimentation rates) play a significant role in the distribu- tion of animals and their traces. Because each specific sedimentary environment is normally associated with a package of factors that controls the distribution of animals and the preservation of their traces in that environment, the develop- ment of ichnofacies models linking trace fossil assemblages with sedimentary facies (Frey & Pemberton 1984) seems entirely logical. It should be borne in. 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
