  SOURCE UNKNOWN--THIS PILE PREDATES THE FIRST EDITION OF CHART 11347 (AUGUST 19, 1967).  SINCE IT IS A LONE PILE THAT HAS NEVER BEEN CHARTED AS "PA" OR "PD", IT COULD HAVE BEEN A CHANNEL MARKER OR A DREDGING MARKER AND MAY HAVE BEEN SHOWN ON A TOPO MANU