Tag: greatunconformity
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Lost ‘mega-escarpment’ across ancient USA may explain Grand Canyon’s missing billion years
Phys.org has an interesting story about the Grand Canyon. The geologic record of the Grand Canyon spans about 2 billion years, but more than half of it is missing! This gap is known as the Great Unconformity. Now, a new study, published in the journal Geology, may have found evidence of what happened those missing…
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One of Geology’s Great Mysteries May Actually Be Many Smaller Mysteries
Atlas Obscura has a story about the The Great Unconformity. In geology, an unconformity is a break in the sequence of time in a continuous rock record. There is usually a large gap of missing rock layers at the contact point between a much older layer and a younger one. It’s caused by a period…
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PBS Eons: When a Billion Years Disappeared
PBS Eons has a new episode on the Great Unconformity, which is a massive gap in sedimentary rocks worldwide. This event might help to explain what brought about the evolution of biomineralization… think bones, teeth, shells, etc. In some places, the rocks below the Great Unconformity are about 1.2 billion years older than those…
