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Tropical circulation intensification and tectonic extension recorded by Neogene terrestrial {delta}18O records of the western United States

Terrestrial water isotope records preserve a history of hydrological cycling that is influenced by past climate and surface topography. 18 O and D records from authigenic minerals of the western United States display a long-term increase during the Neogene in the vicinity of the Sierra Nevada and the central Rocky Mountains (Rockies), but a smaller increase or decrease in the northern Great Basin.
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