By J. A. E. Allum
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Extra resources for Photogeology and Regional Mapping
He lineaments resulting from a number of conformable, dipping, heterogeneous sediments or metasediments can be expected to show the following characteristics: r (I) They should be persistent. If a bed forms a horizon that is more resistant to erosion than the adjacent country rock, it will form a ridge; the ridge may be interrupted by streams following planes of 38 Interpretation—Structural 39 weakness such as joints, but the whole lineament, which consists of all the short lengths of collinear ridges, should persist throughout the full length of the outcrop, see Plate IX, ridge 1.
In many complex or ill-exposed areas, however, structures have to be mapped on the evidence of many separate field observations, without the structures themselves ever being seen. These mapped structures are interpretations, similar in nature and significance to those based on data from other sources, such as the thin rock-section or aerial photograph. It is quite wrong for the geologist, merely as a matter of principle, to attach greater importance to one interpretation than another. Under some conditions, the interpretation of the field data might be the more reliable, but under other conditions, this may be true of the photogeological interpretation.
In many sedimentary areas and in most areas of metasediments, however, the processes of erosion do not produce dip slopes of sufficient length for this symbol to be used. In these areas, the bedding trace symbols should be used with ticks to indicate the general direction and approximate amount of dip, as drawn in Plate V I B , near point 9. There is an obvious source of ambiguity between a short bedding trace symbol and a long foliation symbol. This is deliberate and reflects the likely ambiguity of the interpretation.
Photogeology and Regional Mapping by J. A. E. Allum