. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 13. The skull and vertebral column of a buffalo Simatherium demissum, (SAM-PQ-L23400) in situ in the QSM. dozers, front-end loaders, and tip-trucks, was very destructive. In addition, there were instances where the removal process was not carefully controlled and fossiliferous sediments of the QSM and bed 3aN were mixed. The provenance of material was one of the recurrent problems encoun- tered in the fossil-collecting programme. Material of doubtful provenance includes much of that collected pr
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 13. The skull and vertebral column of a buffalo Simatherium demissum, (SAM-PQ-L23400) in situ in the QSM. dozers, front-end loaders, and tip-trucks, was very destructive. In addition, there were instances where the removal process was not carefully controlled and fossiliferous sediments of the QSM and bed 3aN were mixed. The provenance of material was one of the recurrent problems encoun- tered in the fossil-collecting programme. Material of doubtful provenance includes much of that collected prior to 1969, but the problem continued even when the nature of the succession was well known and exact sites of discovery were recorded. Both beds 3aS and 3aN truncated the QSM, while bed 3aN truncated bed 3aS, and it was in such situations that doubts about provenance arose. Nevertheless, assemblages of known provenance do exist, and it is these that will ultimately be used in the detailed analyses of fossils from particular horizons. A problem which may be impossible to deal with is that of material reworked from pre-existing deposits. It affects mainly bed 3aS, which includes specimens derived from the QSM. The depositional environments of the 'E' Quarry succession need not be discussed again, but some comments on the agencies responsible for concen- trating fossils in certain areas are necessary. The principal agency involved was water action. In the case of the GM fossils, concentration was by wave action, and in QSM III it was the combined effects of the river and tides which led to the accumulation of fossils. Elsewhere in the QSM and in beds 3aS and 3aN the river was largely responsible for concentrating fossils deposited in a subaqueous environment, although a subsidiary role for wave and tidal action cannot be ruled Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
Size: 1608px × 1553px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
