![]() An inclined timber attached to the base of the vertical timber was hinged so that its distal end could move both hor izontally and vertically. The stout pole der r ick consisted of a heavy vertical timber held in place by guy ropes. Parry, in a dark suit, and the quarry foreman in a vest stand next to stone newly broken loose and moved into position for lifting by the derrick. The man at the far left foreground stands on the upper limestone surface where feather and wedges were to be used to break the stone free. The overburden waste of shale and thin-bedded limestone has been removed with the help of the man at the far right and his wheelbarrow. In the photograph taken about 1901, six quarry men and a dog are shown in the foreground of the working Ephraim quarry. Once broken loose from the quarry working face, the quarried stones were moved on to rollers then loaded onto horse-drawn wagons using a derrick. ![]() 7 Erosion by westward flowing streams removed much of the Green River Formation from the Wasatch Plateau and exposed the Green River Formation at the base of the plateau. 6 The underlying Flagstaff Limestone is also tilted upward to the east, and makes up much of the upper surface of the Wasatch Plateau. 5 The minimum age of the monocline is thirty-eight million years. The west side of the valley dropped downward forming the valley and tilting the sedimentary layers upward to the east on what is known as the Wasatch Monocline, which extends seventy miles from Milburn to Salina. Sanpete Valley formed as a result of faulting on the Valley Fault on the west side of the valley. ![]() 4 Exposure of the stone at the surface made quarrying Sanpete oolite stone for construction mater ial an attractive endeavor. The limestone contains small amounts of iron and aluminum oxides that contribute to the pleasing color of the quarried stone. The carbonate minerals are relatively soft and easily carved. Composition includes both calcium and magnesium carbonate. They are either hollow or partially filled with granular material cemented by medium gray silica and calcite. Oolites 1.5 to 2 millimeters in diameter are the most striking textural feature. The properties of the stone reflect its texture, mineralogy, and chemical composition. ![]()
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