. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . FIG. 21. ■exhibited in fig. 21. Sometimes the strata are disjointed, and fig. 22represents a similar instance to the above of change in the direction,probably produced by a like cause; for the beds which at b, strike ina southerly direction, on reaching a, are thrown into vertical and dis- fci* ^^-JUlUUf/H/mi FIG. 22. jointed masses at &*. In other instances, the strata are curved, as isfrequently the case with gneiss, especially in the Jsle of Wight, adelineati
. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . FIG. 21. ■exhibited in fig. 21. Sometimes the strata are disjointed, and fig. 22represents a similar instance to the above of change in the direction,probably produced by a like cause; for the beds which at b, strike ina southerly direction, on reaching a, are thrown into vertical and dis- fci* ^^-JUlUUf/H/mi FIG. 22. jointed masses at &*. In other instances, the strata are curved, as isfrequently the case with gneiss, especially in the Jsle of Wight, adelineation of an instance of which forms the frontispiece of Western Isles, from which fig. 23 is extracted. Inmany cases, especially in the anthracite coal districts, the strata havea waving or arched position, similar to that indicated in fig. 23, whilein other cases they are frightfully contorted, as illustrated in fig. 24. NTHRACITE COAL FORMATION. 145.
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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources
