UNM Newsroom / News / UNM researchers help redefine Grand Canyon’s rock layers

The Great Unconformity

The Great Unconformity

View of the Great Unconformity in Grand Canyon; the Tonto Group above Precambrian basement records flooding of North America 505-500 million years ago, more recently and more rapidly than previously thought.

Measurements in the Tapeats sandstone

Measurements in the Tapeats sandstone

Karl Karlstrom taking measurements in the Tapeats sandstone to decipher paleocurrent directions during deposition.

Cross bedded outcrops of the Tapeats Sandstone

Cross bedded outcrops of the Tapeats Sandstone

Karl Karlstrom sitting on cross bedded outcrops of the Tapeats Sandstone that was deposited at sea level 500 million years ago and is now exposed deep in Grand Canyon.

UNM researchers help redefine Grand Canyon’s rock layers

Cambrian Sixtymile Formation of Grand Canyon yields new findings

By Steve Carr May 31, 2018

Categories: Front Page College of Arts & Sciences Earth & Planetary Sciences Research

Tags: Research

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