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- W181783911 abstract "The Colorado and Brazos Rivers flow in exhumed pre-middle-Cretaceous valleys between the Caprock Escarpment and the Balcones Fault Zone. Some segments flow southeastward, defining lineaments that are expressed in Cretaceous and Tertiary rocks as well as in older ones, but other segments clearly reflect the older topography. The early Cretaceous valleys were filled episodically by uncemented sand, silt, and dolomitic clay prior to complete inundation of Texas by the late Fredericksburg sea. The authors suggest that groundwater stored in the unconsolidated material played a major role in late Tertiary/early Pleistocene exhumation of the paleovalleys. The first tributary to cut into the Hensel/Gillespie Sands at Marble Falls intersected a paleovalley filled by water-bearing sand. A conservative estimate suggests that more than 100 million acre/feet of water (20,000 square miles x 640 acres x 30 feet of sand x 30% porosity) would have been tapped. Successful streams would excavate rapidly headward as well as downstream, and would soon capture nearby, less successful streams still flowing above the aquifer. The result would not be a catastrophic flood, but would be a geologically very rapid increase in sustained baseflow. The Brazos Valley below the Caprock does not appear to have such a well-marked pointmore » of paleovalley discharge, but has a broadly similar geometry. Water stored in the Antlers Sand may have provided even larger volume than that in the Hensel/Gellespie. Implications of this scenario for sediment deposition are intriguing. A newly-formed trunk stream that tapped a major ground-water reservoir would display a rapid increase in baseflow discharge, accompanied by erosion downstream. A major shoreline deposit might form, whose timing was unrelated to regional climatic events or global sea-level changes.« less" @default.
- W181783911 created "2016-06-24" @default.
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- W181783911 date "1993-02-01" @default.
- W181783911 modified "2023-09-26" @default.
- W181783911 title "Stored groundwater--A force to reckon with in the geomorphology of central and north Texas" @default.
- W181783911 hasPublicationYear "1993" @default.
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