Sugarloaf Cove Cobble

October 21, 2010


Dale L. Hugo
Summary Author: Dale L. Hugo

Shown above is a stretch of variegated cobble composed of several different kinds of rock as photographed near Sugarloaf Cove, Minnesota, on the shore of Lake Superior. At the end of the last ice age (approximately 10,000 years ago), retreating glaciers brought together a variety of rock types that are now well worn by the wave action on the big lake. These cobbles form a tombolo (a strip of land connecting an island to the mainland) off of Sugarloaf Cove. Such strips are rare in Lake Superior since there aren't all that many offshore islands and because extreme storms on occasion cause huge waves that wash out loose lying sediment. For scale purposes, my shoe is at lower right. Photo taken on August 13, 2009.

Photo details: Camera Maker: Samsung Techwin; Camera Model: <Samsung D70 / D75 / S730 / S750>; Focal Length: 5.8mm (35mm equivalent: 35mm); Aperture: f/7.1; Exposure Time: 0.0040 s (1/250); ISO equiv: 80
Exposure Bias: none; Metering Mode: Matrix; Exposure: program (Auto); White Balance: Auto; Flash Fired: No; Color Space: sRGB.