“…In theory, roundness increases with the distance a clast has traveled in a given stream, and thus can be used as evidence for the distance a clast has been transported, and in some cases for the flow direction (e.g., Lindsey et al, 2007). But, as field and laboratory studies have indicated the increase is most rapid in the first few kilometers of transport, and reaches a dynamic equilibrium quickly, making it a parameter with only limited potential for determining travel distance (Potter and Pettijohn, 1977).…”