what is it? or more importantly where is it?
photograph Auchmithie, Scotland, the term
Great Unconformity is frequently applied to either the unconformity observed by
James Hutton in 1787 at Siccar Point in Scotland, or that observed by John Wesley Powell in the Grand Canyon in 1869, the Great
Unconformity (GU) is one of geology’s deepest mysteries. It is a gap of missing
time in the geological record between 100 million and 1 billion years long, and
it occurs in different rock sections around the world. When and how the GU came
to be is still not totally resolved, the missing time, this means that some 550
million-year-old rocks are found that date back 1.7 billion years, but no other
traces from the years in between were found, how strange is that? for the Neoproterozoic
glacial origin of the Great Unconformity, have a look here.
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