Word: rocks
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...tunnel traffic a new and livelier commodity: steam. Chicago's freight tunnels, which most Chicagoans live and die without ever seeing, have little likeness to the passenger subways of other cities. They lie not just beneath the street but 40 feet below the surface. Driven through clay (bed rock is several hundred feet below the surface in Chicago's Loop) and walled with concrete a foot thick, they are but six feet wide and seven and a half feet high. There are 62 miles of such tunnels, under nearly every street of downtown Chicago. Through them engineers guide...
Mail trucks clatter by carrying pouches for New Orleans, Butte, Little Rock, Winnetka, Miami, Ottumwa, and Dallas. Letters from angry fathers, distraught mothers, improvident sons, enamored daughters; letters from salesmen in shiny blue serge suits, executives in State Street, swathy Armenians, and pious Baptist priests...
...Tethys Deep" was bridged by Central America was indicated by Yale's Dr. Hellmut de Terra. With the cooling and shrinking of earth's underlying shell of magmatic (semifluid) rock, the northern and southern land masses drew toward each other. Pinched between them, the bottom of the "Tethys Deep" wrinkled, bulged upward, finally, as the pressure increased, emerged from the water to form a bridge...
Petrofabrics. Whether terrestrial or cosmic, the forces that built the Alps tied them into complicated kinks. Bruno Sander, a native of the Austrian Tyrol and professor at the University of Innsbruck, described his method of studying the kinks. Specimens of crystalline rock were ground to paper thinness, peered at under the microscope where the force lines spring to view. By plotting hundreds of force lines from different parts of a mountain, he deduces the slidings and thrustings that formed the mountain. He calls his method petrofabrics, thinks it may prove useful in locating ore veins...
...Rock Chart. Toward the close of the Congress, Chief Geologist Dr. Timothy William Stanton of the U. S. Geological Survey proudly exhibited a variegated rectangle 87x51 in.-an elaborate chart of all U. S. rocks, in 23 colors arranged in 160 units. It summarized the Survey's work since 1879. filled a long-felt need of schools. Said Dr. Stanton: "In 1911 we had a map, but it was far less complete and detailed. Also for more than 15 years past it has been out of print...