Bouse herringbone pattern (IMAGE)
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The herringbone pattern seen in cross-bedded carbonate sands in the Bouse Formation, University of Oregon researchers conclude, is the result of the classic back-and-forth movement of water unique to ocean tidal systems. UO researchers have published two new papers that solidify their belief that the lower Colorado River valley, now a desert region, was covered by marine tidal basins during a hot, humid climate more than 5 million years ago.
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Photo by Rebecca Dorsey
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