A Mighty Fine Rock

A bit erratic perhaps, but darn pretty.

Two tourists were hiking in the Chequamegon-Nicolet National Forest.  

“I wonder where all these rocks came from?” - One tourist asked.

“Well,” said the other tourist. “I hear the glacier brought 'em.”

“So where is the glacier now?” - The first tourist asked.

“I guess it went back for more rocks.” – Was the reply.

Geologists have their faults (bada boom) but no one can accuse them of lacking a funny streak.