Breadcrumb Photo Gallery Lake Michigan Limestone Shelves, Door Peninsula Limestone Shelves, Door Peninsula Last updated by System administrator November 16, 2008 Underwater fractured limestone shelves, off the east shore of the Door Peninsula near Rock Island, a reminder of the challenges and hazards of cruising this coast. Jim Caraway photo... Become a Member How to Join Member Benefits & Discounts Membership Application About the GLCC A Bit of History Contact Us Active forum topics Windy 26sn.Windy 26sn.GLCC members near Frankfort, MISecond or Stern anchor in North Channel and Georgian BayTraining exercise: radarMore