Notes on a bedrock channel and paleostage indicators, Northgate Canyon, North Platte River, Wyoming, USA

A geomorphic essay on Northgate Canyon and the upper North Platte River provides the setting for a detailed discussion and evaluation of paleostage indicators at Sixmile Gap. Lichens are the indicator selected for use as an index to longterm flood peaks. A cross-section survey, tied to the elevation of certain lichen horizons and a calculation of the discharge at this level are used to assess the accuracy of the technique.