A Popular Guide to the Observation of Nature; Or, Hints of Inducement to the ...
A Popular Guide to the Observation of Nature; Or, Hints of Inducement to the ...
Robert Mudie
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The digging of a quarry, Or even the cutting of a drain, n^ay b^ made 9 study of nature^ and the hand that works may work with more ardour and success in consequence of there bein^ instruction, and consequently pleasure, in the working. The coal mines, from the extent and depth to i^hich they have been worked, ai:e perhaps the best daces for observing the traces of that working. The coal itself has been vegetable matter, for th^re are vegetable impressions in it. It U^s generally in basins, and... there are in most cases many seams, and some of them deep below others, so that the "coal measures,*' or strata in which the coal is fpund, have been fori^ed gradually. They consist chiefly of limestone clay, iron stone, and sandfilone , ,y Google COAL ntaM. 251 .thfi accumulation of which must have tequired a lojig period of years. But they also shotv traces of volcanic action, in the "dikes and cutt^^s," by which they are intersected, and which often throw the strata out of the plan6, so that the coal is higher ou one side of the dike than on the other.
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