Trap-rock sentence example

trap-rock
  • In 1907 Massachusetts ranked sixth among the states in the value of its trap rock product ($432,604), and eighth in sandstone ($243,328).

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  • The greater part of Central India is covered with the well-known "black cotton soil," produced by the disintegration of the trap rock.

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  • A noteworthy feature of this area is the series of trap rock ridges, between which the Passaic river makes its irregular way through a region of flat bottom lands.

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  • Granite is found in Morris and Sussex counties, but is not extensively quarried; there are extensive quarries of sandstone in the Piedmont section; and limestone and trap rock are important mineral resources.

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  • The excellence of the waggon roads of the state is largely due to the plentiful supply of trap rock in New Jersey.

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  • These consist mostly of granite and gneiss, but in the north-central section there is trap-rock, and in the south-east section some slate.

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