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Showing 1 to 3 of 3 for “"Lava Creek B ash"”.
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Quaternary incision history of the Black Canyon of the Gunnison, Colorado
… profile, reconstructed from terraces containing Lava Creek B ash, indicates ~25km upstream migration. The best age constraint and incision rate of Black Canyon comes from projecting the ~640 ka Shinn-Boswick tributary to its intersection with the Gunnison, suggesting 350-400 m of incision 700m …
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New incision rates on the Colorado River system based on cosmogenic burial dating of terraces : implications for a transient knickpoint at Lees Ferry and differential uplift of the Rocky Mountains
… Reconstruction of paleo-profiles from the 640 ka Lava Creek B terrace suggests rates of knickpoint migration of >150 m/ka in soft rock. Hard bedrock often coincides with knickzones and appears to slow knickpoint migration (<50 m/ka). Semi-steady average incision rates of 150 m/Ma over the last ten …
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EPISODIC UPLIFT OF THE ROCKY MOUNTAINS: EVIDENCE FROM U-PB DETRITAL ZIRCON GEOCHRONOLOGY AND LOW-TEMPERATURE THERMOCHRONOLOGY WITH A CHAPTER ON USING MOBILE TECHNOLOGY FOR GEOSCIENCE EDUCATION
… suggesting it is a transient feature. Lava Creek B ash constrains strath terraces along a paleo-profile of the river. Within the paleo-Bostwick River tributary, we determine an incision rate of 400-550 m/Ma, reflecting incision at 2-3 times regional incision rates. We interpret this to …