. Bulletin of the British Museum (Natural History). 146 Till- Earth Generated ami Aiialomized. FIGURE 3 Mentioned in Hobbs's Manuscript on pages i (39), 15 (48), 16 (49), 17 (50), 18 (50),91 (97), 119(112). This diagram is lost and has been reconstructed. It is designed to show that strata are generally found parallel to each other, and in hilly country parallel to the line of the hills. Hobbs notes how strata run unbroken, at an angle of perhaps 20 or 40° along one side of the hill (, dip slope) but are broken off sharply along the other side { scarp face). He notes how materials (inc
. Bulletin of the British Museum (Natural History). 146 Till- Earth Generated ami Aiialomized. FIGURE 3 Mentioned in Hobbs's Manuscript on pages i (39), 15 (48), 16 (49), 17 (50), 18 (50),91 (97), 119(112). This diagram is lost and has been reconstructed. It is designed to show that strata are generally found parallel to each other, and in hilly country parallel to the line of the hills. Hobbs notes how strata run unbroken, at an angle of perhaps 20 or 40° along one side of the hill (, dip slope) but are broken off sharply along the other side { scarp face). He notes how materials (including trees) become detached from near the top of the scarp face and tumble down to form mounds of rubbish. Presumably this diagram illustrates his discussion on p. 120 (112) of finding tree trunks having tumbled down from a high hill near Shaston (= Shaftesbury). In the Shaftesbury area there arc several beds which Hobbs might have had in mind when referring to his hill. The detachment of bed A suggests that it was a competent (geological speaking) bed such as limestone underlain bv a softer sand or clay. There seems to be no definite way of discovering which hill and strata Hobbs had in mind. In his discussion of how a knowledge of the geometry of stratification can help discovery of mines, etc., Hobbs argues that if a seam is found at 2B, 130' down from G, one can predict that the same seam will be found at Bi, three or four feet down from B (by which he presumably means under the top-soil).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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