THIS EXOTIC GRANITE BOULDER
UNEARTHED DURING SITE
EXCAVATION IN 2011, IS BELIEVED
TO HAVE FLOATED INTO HILLSBORO ON
AN ICE RAFT ABOUT 15,000 YEARS AGO
DURING THE CATASTROPHIC MISSOULA
FLOODS. SCIENTISTS SAY THAT A 200 FT
HIGH FLOOD OF WATER AND ICE
MOVING 35,000 TIMES THE VOLUME OF
NIAGARA FALLS ROARED DOWN THE
COLUMBIA RIVER DRAINAGE CARRYING
THIS "ERRATIC" BOULDER WHICH CAME
FROM MONTANA, IDAHO, OR CANADA