The effect of sediment type on the shape and stratification of some modern fluvial deposits; a reply

Abstract

The percent silt-clay in sediment appears to be indicative of somephysical properties of that sediment. Sil-clay is defined as thatmaterial passing the 200 mesh sieve of smaller than 0.074 mm. Theshape of a stream channel cross section is found to be inverselyrelated to the weighted mean percent silt-clay in channel banks andfloor. The shape of paleochannels and their included channel-filldeposits may be similarly related to sediment type.Observations along actively aggrading streams suggest that the stratificationof channel-fill deposits may also be related to the percent silt-clayin these deposits. Stratification planes may be concave in channelfills composed of predominant silt-clay; whereas, they may be horizontalwhere the silt-clay content of the alluvium is small, and even convexin those channel fills with negligible silt-clay.