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On valleyside slope in the study area, there is an almost continous, extremely well-defined surface layer of colluvium, resting with marked uncorformity on subjacent materials. This latter materials may be relatively fresh bedrock, weathered rock or cemented gravels (older colluvial deposits). The younger colluvial layer transgresses all of these with little apparent change in general appearance, extending into relatively thick, recent valley fills. The term “recent” is used here to refer to the surface layer of valley fill which is predominantly fined grained (sand particle size and smaller, with varyinh amounts of gravel) unconsolidated essentially non-stratified deposit which in these respects and in being physically contioguous with the valleyside colluvial layer – is the stratigraphic contemporary of the colluvial layer. |
