![]() ![]() These are remnants of the calcite, or limestone layer that was once here. Whitish gravel and chunks of sand also make an appearance. ![]() Tell us the GPS coordinates if you happen to find it!Īs you crest the hill, the trail begins to undulate and you’ll notice the tone of the landscape has taken on more jagged, sloping characteristics. Indeed, there is a small, but hard-to-find dinosaur track about 50 yards from the end of the trail. So this hill that makes you go “erg” is what remains of a gigantic sand dune that actually saw dinosaurs walk upon it. ![]() Today, the Navajo sandstone is once again exposed, and its top layer turning to sand. After the bedrock of Navajo Sandstone formed, other sedimentary layers of sandstone, mudstone, calcite and limestone settled on top of it, then began to wear away under the constant scouring of relentless winds, flash floods, and extreme heat and cold. Known to geologists as “ergs,” they eventually became petrified (turned to stone) by water and minerals, solidifying into a uniform layer of sandstone over 2,000’ thick in some areas. As you exit your vehicle in the newly-expanded Horseshoe Bend parking area just South of Page, Arizona, your will make your way around a newly paved walkway that avoids the original mildly steep incline that included sometimes unwieldy sand.Ībout 200 million years ago, a massive sea of sand dunes covered the landscape from Arizona to Wyoming. ![]()
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