https://geoscan.nrcan.gc.ca/starweb/nrcanphoto/servlet.starweb?path=nrcanphoto/nrcanphotofastlink_f.web&search1=R=56159
Natural Resources Canada, 2004
Sanford, B. V., Evidence for the presence of a cylindrical column in Sloan Quarry. Overturned block of Chippewa Bay showing basal quartzite to cobble...
Photographie