These graphs show how fluctation of ice retreat and advance is related to mass balance and the formation of a push moraine.  In picture D. (corralated with both graphs as D.) we see our glacier is near equillbrium which allows it to maintain its position or advance slightly, thus allowing for a build up of a proglacial sediment fan (depicted here as draping off the toe of the ice) and to accumulate basal till(depicted here as a black sheet at the ice-basal interface).  In series C. the mass balance reteats due to a drop in balance, this spreds out the sedimentary fan and continuous to accumulate basal till.  In series B. mass balance is positve causing the glacier to advance and ride over or push its sedimentary fan and till sequence,  this creates deformation thrusting as seen in B.  In picture A. we see the remains of glaciotectonic processes in the form of a push moraine, with the back arc filled in with a retreating phase till plane.
 

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