Three new experiments are described which exhibit strong pattern forma
tion in the deposits left by successive granular avalanches. At low fl
ow rates continuous deposition, erosion or rotation gives rise to inte
rmittent avalanche release. Once in motion kinetic sieving of a bi-dis
perse granular mixture creates a two-layer shear band in which the lar
ger particles overlie the smaller particles. When this is brought abru
ptly to rest by the upslope propagation of a shock wave a pair of stri
pes is ''frozen'' into the deposited material. Successive releases cre
ate a large scale pattern, which strongly reflects the history of the
granular flow. At faster deposition, erosion and rotation rates a new
flow regime is entered in which intermittency and shock formation ceas
es, and the associated patterns change.