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  • We hauled a whole bunch of traprock up slope to use as trail edges and erosion stops, moved a rock roughly the size of a coffee table to make a step on one of the staircases up to the clifftop, and (while quoteing Robert Frost at each other) built a dry stone wall to reroute traffic around an eroded trail section.

    my apple trees will never get across and eat the cones under his pines

  • The most common types of stone processed into crushed stone include limestone and dolomite, granite, and traprock.

    Crushed stone

  • * On the Pacific side, the rock basalt, or traprock was quarried and crushed right at Ancon Hill, while the sand came from Chamé Point, in the Bay of Panama.

    The Path Between the Seas

  • He also had forty iron straps bolted against the roof from below, and inside the air chamber, directly under the line of the fire, he had great square blocks of traprock set in the concrete that was being put down over the rest of the chamber floor.

    The Great Bridge

  • During the test borings on the Brooklyn side, the material encountered had been composed chiefly of compact sand and gravel, mixed with clay and interspersed with boulders of traprock, the latter of which, he allowed, had “detained this operation considerably.”

    The Great Bridge

  • In the middle chambers the ground was nearly all traprock, packed like gravel and joined by what Roebling described as a natural cement made of decomposed fragments of green serpentine rock.

    The Great Bridge

  • As the men dug into the caisson floor, the traprock emerged in chunks the size of paving blocks or in monstrous boulders, but when a shovel or pick first struck one of them, with a sharp metallic clink, there was no telling which size it would turn out to be.

    The Great Bridge

  • The hard crystalline traprock split more easily than the tough gneiss or rotten quartz boulders.

    The Great Bridge

  • Invariably the traprock broke neatly into three equal-sized boulders.

    The Great Bridge

  • This traprock, as it was commonly called, was basalt, an igneous rock, like granite, and nearly as hard.

    The Great Bridge


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