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Geotechnical Egineering News tagged with [the Great Unconformity]

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Earth is missing a huge part of its crust. Now we may know why.
National Geographic   31 December 2018   World  
<p>A fifth of Earth&rsquo;s geologic history might have vanished because planet-wide glaciers buried the evidence.</p> <p>The Grand Canyon is a gigantic geological library, with rocky layers that tell much of the story of Earth&rsquo;s history. Curiously though, ...