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Grand Canyon, USA: America’s great Southwestern cleavage
Christopher Lombardi, Special publications, Published on 30/05/2019
» One of the crown jewels of the U.S. parks system and an internationally renowned icon of the American Southwest, <b>Grand Canyon National Park</b> was established in 1919 to showcase and preserve the gargantuan desert chasm whose age is estimated at around two million years. The visually stunning landmark and UNESCO World Heritage site slices 445 kilometres through the Arizona desert, plunging 1.5 km at its deepest and varying in width from one-half to 30 km. The strikingly stratified walls of its three main gorges display a geological record that spans the four main eras of Earth's evolutionary history, from the <i>Precambrian</i> to the <I>Cainozoic</I>.
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