This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...c), which run lor some way approximately parallel to it. The coal has either been prevented from accumulating in contemporaneous water-channels, or, while still in the condition of soft bog-like vegetation, has been eroded by streamlets flowing through it.1 A section drawn across such a buried channel exhibits the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...c), which run lor some way approximately parallel to it. The coal has either been prevented from accumulating in contemporaneous water-channels, or, while still in the condition of soft bog-like vegetation, has been eroded by streamlets flowing through it.1 A section drawn across such a buried channel exhibits the structure represented in Fig. 192, where a bed of fire-clay (e), full of roots and evidently an old soil, supports a bed of coal (d) and of shale (c), which, during the deposition of this series of strata, have been cut out into a channel at /. A deposition of sand (b) has then filled up the excavation, and a layer of mud (a) has covered up the whole. Fig. 102.--Section Of A Channel In A Coal-seam (ii.). Currents of very unequal force and transporting power may alternate in such a way that after fine silt has for some time been accumulated, coarse shingle may next be swept along, and may be so irregularly bedded with the softer strata as to simulate the behaviour of an intrusive rock (Fig. 193).3 The section (Fig. 194), taken by De la Beche from a cliff of Coal-measures on the coast of Pembrokeshire, shows a deposit of shale (a) that during the course of its formation was eroded by a channel at b, into which sand was Fio. 103.--Irregular Bedding Ok Coarse And Fine Lower Silurian Detritus. Flanks Of Glvdyh, N.E. Of Snowdon (Z?.). carried; after which, the deposit of fine mud recommenced, and similar shale as before was laid down upon the top of the sandy layer, until, by a more potent current, the shale deposit was cut away on the left side of the section and a series of sand beds (c) was laid down upon its eroded edges. An interruption of this kind, however, may not seriously disturb the earlier conditions of a deposit which, as Rhown in the same ...
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