Date of this Version
In Flat Water: A History of Nebraska and Its Water, ed. Robert D. Kuzelka, Charles A. Flowerday, Robert N. Manley, Bradley C. Rundquist, Sally J. Herrin. Resource Report No. 12, March 1993. Conservation and Survey Division, Institute of Agriculture and Natural Resources, University of Nebraska-Lincoln, pp. 50-54.
Nebraska is blessed with abundant groundwater. This groundwater is found beneath much of the state, principally in the sediments and sedimentary rocks that blanket the ancient and largely crystalline rocks geologists call Precambrian (see block diagram of Nebraska's geology, p. 50). These younger deposits contain pieces of evidence such as fossils and sedimentary features that reveal the tremendous changes in the environment that have gone on over the last 570 million years, during which these deposits accumulated. Change is the name of the game in geologic history, just as it is in human history. Fundamental changes in geologic history across the Great Plains states, particularly during the last 66.5 million years (the Cenozoic Era), have had a dramatic role in and effect on the creation or destruction of the state's waterbearing sediments and rocks.