Researchers suggest missing crust layer can be blamed on 'Snowball Earth'

phys.org | 1/3/2019 | Staff
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An international team of researchers has found evidence supporting a theory that suggests a missing crust layer can be blamed on "Snowball Earth." In their paper published in Proceedings of the National Academy of Sciences, the group describes the evidence they found and why they believe it supports their theory.

Earth scientists have debated the reason behind what they describe as a missing crust layer for over a century—in 1869, geologists noted that there appeared to be a missing layer of rock in the Grand Canyon. Samples showed a layer dating back 540 million years, and directly below it, a layer that was dated to 1 billion years ago. This posed the question: What happened in-between? That gap has been observed in other places on Earth, and has been named "the Great Unconformity." To explain the gap, scientists developed two theories—either there was a dramatic increase in sedimentation, or there was a large and rapid erosion event. In this new effort, the researchers claim to have found evidence that supports the latter theory.

Researchers - Erosion - Event

The researchers suggest that the large erosion event...
(Excerpt) Read more at: phys.org
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