. Off-hand sketches : a companion for the tourist and traveller over the Philadelphia, Pottsville, and Reading railroad . FIG. 25. FIG. 26. the aides to pressure, upon which the curved appearance indicatedin fig. 26 was the result. It is thus that, by the chemical opera-tions within the interior of the earth, the strata have been contortedand thrown into every imaginable shape and position, while theunstratified rocks have, at the same time, been heaved up, andn T 146 OFF-HAND SKETCHES. thrown around in irregular shapes and quantities. The unstratified,which are the oldest of all rocks, differ
. Off-hand sketches : a companion for the tourist and traveller over the Philadelphia, Pottsville, and Reading railroad . FIG. 25. FIG. 26. the aides to pressure, upon which the curved appearance indicatedin fig. 26 was the result. It is thus that, by the chemical opera-tions within the interior of the earth, the strata have been contortedand thrown into every imaginable shape and position, while theunstratified rocks have, at the same time, been heaved up, andn T 146 OFF-HAND SKETCHES. thrown around in irregular shapes and quantities. The unstratified,which are the oldest of all rocks, differ from the sedimentary prin-cipally in having no lines or parallel markings; but present a shape-less and irregular mass of mineral matter, similar to fig. 27. But. FIG. 27. while the granite, and other rocks of igneous origin, are unstratified,they still occur in veins, which are sometimes traversed by otherveins newer than themselves. This is illustrated in fig. 28, wherethe new veins project over the old granite somewhat like the hornsof a deer. These veins often penetrate the overlying deposits, andflow over the rocks which they displace, as exhibited in fig. 29.
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Keywords: ., bookcentury1800, bookdecade1850, bookidoffhandsketc, bookyear1854
