“The photo shows a glacial drop stone (pink quartzite) deposited in Precambrian Huronian Age tillite. It fell from the bottom of an ancient glacier into a slow moving stream flowing over the clay bed. Just above and to the right of the granite there is a later and smaller drop stone slightly lighter in coloring from the clay. The distortion of the clay deposition around the boulder suggests the stream flow under the ice was from left to right. I found this loose piece at a road cut at 46° 26' 55" N, 83° 44' 01" W north of Bruce Mines, Algoma District, Ontario while exploring road-cuts with our friend Betty Buchanan who lives in Huron Shores. Nice roadside view with Google Earth at the above coordinates. The size of the tillite fragment is 11 x 8 cm and the quartzite pebble has a diameter of about 2 cm. Thanks to W. Richard Gunter, Ed Clopton, Woody Thompson, Paul Brandes for assistance with the descriptive notes.”