When I took this photograph I didn’t have any specific knowledge of this geology because we […] This week's Friday Field Foto is from an area just west of Death Valley called Darwin Canyon.

The mystery of the Great Unconformity is inherently tied to two of geology’s other great enigmas: the rise and fall of Snowball Earth and the sudden emergence of complex life in the Ediacaran and ...

The contact between the sediments and the tuff is an angular unconformity — a boundary where one rock unit cuts across the layering of another. This indicates a period of erosion and a time when ...

Scientists are floating a new way to explain a geological feature called the Great Unconformity, where the record of a billion years is just missing from between the layers of rock. Or, to be more ...

The great unconformity A billion years is missing from the geologic record; one UC Santa Barbara scientist believes he knows where it may have gone Peer-Reviewed Publication University of ...

The size of the Great Unconformity also differs across the canyon, with a smaller gap to the east, Peak said. At its smallest, the gap covers about 250 million years.

The Great Unconformity has in turn often been suggested as being an erosional feature, but some geologists balked at the idea of such a massive amount of Earth’s crust being so thoroughly wiped ...