During times of extremely high flooding, rapid deposition often takes place on the point bar because of river currents cutting across the meander loop, attempting to shorten its course. In those instances, thick sequences of rapidly deposited, well-developed climbing ripples capped by contorted laminations are common ([[:file:M31F5.jpg|Figure 4C]]). Deposition of 1 to 2 m can take place over only a few hours to a day. Most commonly the distorted bedding simply caps the sand unit, but the entirebed can be rendered into a fluid state and massive contortions can be present ([[:file:M31F5.jpg|Figure 4D]]). The zone of maximum contorted bedding often closely approximate the low-water river level and extends upward into the zone covered by flood waters. The uppermost unit of the meander point bar often consists of silt and sand beds (few centimeters thick) displaying ripple laminations alternating with silty-clay and clay beds exhibiting root burrows ([[:file:M31F5.jpg|Figure 4E]]). In these uppermost units iron oxide and calcium carbonate nodules usually are abundant. | During times of extremely high flooding, rapid deposition often takes place on the point bar because of river currents cutting across the meander loop, attempting to shorten its course. In those instances, thick sequences of rapidly deposited, well-developed climbing ripples capped by contorted laminations are common ([[:file:M31F5.jpg|Figure 4C]]). Deposition of 1 to 2 m can take place over only a few hours to a day. Most commonly the distorted bedding simply caps the sand unit, but the entirebed can be rendered into a fluid state and massive contortions can be present ([[:file:M31F5.jpg|Figure 4D]]). The zone of maximum contorted bedding often closely approximate the low-water river level and extends upward into the zone covered by flood waters. The uppermost unit of the meander point bar often consists of silt and sand beds (few centimeters thick) displaying ripple laminations alternating with silty-clay and clay beds exhibiting root burrows ([[:file:M31F5.jpg|Figure 4E]]). In these uppermost units iron oxide and calcium carbonate nodules usually are abundant. |