The Intellectual Observer, 1865, Vol. 6

The Intellectual Observer, 1865, Vol. 6

1962.5 руб.
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Excerpt from The Intellectual Observer, 1865, Vol. 6: Review of Natural History, Microscopic Research and Recreative Science; Illustrated With Plates in Colours and Tints, and Numerous Engravings on Wood

To understand the nature of this out crop, it must be stated that the South Sta?'ordshire coal-measures repose immediately upon the Silurian beds, no Old Red Sandstone or Mountain Lime stone intervening, from which it is inferred that the area under notice was dry land during the de osition of the absent members of the geological series. When t 6 coal was in course of forma tion it would seem the underlying Silurian rocks had, to some extent, assumed their present position; but, tos the close of the Carboniferous era, the igneous action, which had in this locality been a disturbin element from the commencement, became more intense, an in one place especially it found a ready vent through which the mass of molten material, forming the Rowley ridge of hills, was ejected. It is probable that, at this period, the three existing dome-shaped bosses of Silurian rocks, extending northwards in the line of the Rowley Hills, were elevated very considerably above their former level, throwing out the coal-measures which at that time more or less completely covered them. Thus it is that we now find the thick coal and other seams almost horizontal at a short distance from the Silurian eminences but all round the ?anks of these hills the coal is highly inclined, and at its out-crop is only overlaid by about ten feet of superficial deposits, consisting of drift sand and clay, containing water-worn fossils from the adjacent Limestone beds.

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