By B. Kolb
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Example text
Obviously, the first model implies simultaneous facies change on a world-wide scale, whereas, by the second model, such changes should be locally restricted. The two alternative models therefore clearly indicate the type of observation which is needed for further interpretation and such data may be already available or they may have to be collected. This simple example illustrates that the speculative approach of forming a hypothesis or model is usually resorted to when the direct evidence of the sedimentary record cannot be interpreted any further, and one may regard the model approach as a complete reversal of the normal geological working methods.
4 Ancient sedimentation rates as deduced from fossil varves (in pmmlyear) Montery formation' Kuban formation' Black Hills formation' Toledo limestone3 Blue Lias (shale)' Blue Lias (limestone)' Castille formation3 ~oferites~ Gypsum3 Silts' Shales' Tertiary Tertiary Cretacous Jurassic Permian Permian Permian Triassic Permian Carboniferous Silurian 100-200 200 200 170 25-42 230 130 1300 1398 2760 2106 ' Quoted after Duff et al. (1967). 'Quoted after Bubnoff (1947). Anderson and Kirkland (1960). Schwarzacher (1947).
Either, this is again a case of two merging bedding planes in which the actual merging is not recorded, or, there may be a genuine difference in the sedimentation history of the two areas. The technical difficulties in tracing individual bedding planes over large areas are naturally quite considerable. Such work requires painstaking mapping, together with a constant awareness that changes are not only possible but are to be expected. It should not come as a surprise that some beds contained in persistent bedding planes change their facies.