In the midcontinent there is a remarkable correlation between the tilt rates measured by geodetic releveling and the downstream change in sinuosity of adjacent rivers. The correlation indicates that measured tilts with rates reaching 10−7 rad yr−1 and that extend for 15 to 50 km represent real crustal movements and not errors or near-surface effects. The tilting has probably continued for less than 1,500 yr and may involve oscillatory movements of crustal blocks.

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