Notes On Geological Map Reading
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To realise the relation, turn to figs. 14-16, and suppose ad and bf now to represent one and the same bedding-plane on opposite sides of a dip-fault ; or for a strike-fault imagine the bedding-plane on one side produced across the fault. It is easily seen that the relation between the vertical throw of a fault and the shift which it causes is precisely the same as the relation between the vertical thickness of a formation and the width of its outcrop. The discussion in 20, 21 can therefore be a...pplied, with the necessary substitution of terms, to the case of faulting. Note that the boundary-line on the downthrow side is always shifted backward (i. E. In the direction opposite to that of dip), save only in the exceptional case (fig. 16, B) in which the slope is steeper than the dip.
(27) For illustration take first the strike-fault shown in fig. 19. Here the dip, 100 in 1125, is seen to be the same on both sides of the fault. The downthrow is north-westward, and so against the dip. Accordingly there is repetition of beds in a traverse downstream, the formation A reappearing as a " faulted inlier.
What to read after Notes On Geological Map Reading?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Harker to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
To realise the relation, turn to figs. 14-16, and suppose ad and bf now to represent one and the same bedding-plane on opposite sides of a dip-fault ; or for a strike-fault imagine the bedding-plane on one side produced across the fault. It is easily seen that the relation between the vertical throw of a fault and the shift which it causes is precisely the same as the relation between the vertical thickness of a formation and the width of its outcrop. The discussion in 20, 21 can therefore be a...pplied, with the necessary substitution of terms, to the case of faulting. Note that the boundary-line on the downthrow side is always shifted backward (i. E. In the direction opposite to that of dip), save only in the exceptional case (fig. 16, B) in which the slope is steeper than the dip.
(27) For illustration take first the strike-fault shown in fig. 19. Here the dip, 100 in 1125, is seen to be the same on both sides of the fault. The downthrow is north-westward, and so against the dip. Accordingly there is repetition of beds in a traverse downstream, the formation A reappearing as a " faulted inlier.
What to read after Notes On Geological Map Reading?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Harker to read onlineMoreLess
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