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Re: The Great Lakes - shorelines, land bridges, sinkholes

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  • Susan English
    Stan, thank you for sending the recent MSNBC article, Scientists study Michigan land bridge . The 2006 and upcoming 2007 documentary on Great Lakes, Ancient
    Message 1 of 2 , Jan 3, 2007
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      Stan, thank you for sending the recent MSNBC article, "Scientists
      study Michigan land bridge". The 2006 and upcoming 2007 documentary
      on "Great Lakes, Ancient Shores" are films I truly don't want to
      miss. If any of you come across dates/times/places for either of
      these, please post to this site or to a personal email.

      That area of research, Stan, may also interrelate to a link I sent
      today in regarad to work by Canadian and Michigan geologists on the
      continuing discoveries of whale bones found around Lake Michigan.


      --- In ancient_waterways_society@yahoogroups.com, "minnesotastan"
      <minnesotastan@...> wrote:

      Scientists study Michigan land bridge
      Research is the subject of a documentary about the ancient Great
      Lakes The Associated Press
      Updated: 12:11 p.m. CT Dec 19, 2006

      PONTIAC, Mich. - Scientists hope to learn more about what the Great
      Lakes' shorelines looked like about 10,000 years ago. They explored a
      limestone land bridge that went from Alpena to Goderich, Ontario — a
      distance of about 125 miles — and an underwater forest of petrified
      trees in Lake Huron.

      The 2006 research, in which more than 500 dives were made, is the
      subject of a documentary film, "Great Lakes, Ancient Shores,
      Sinkholes." It premiered recently at the Cranbrook Institute of Arts
      in Bloomfield Hills, The Oakland Press reported in a story published

      Another study is planned for 2007 and should result in a second
      film, "Great Lakes, Ancient Shores," said Luke Clyburn, lieutenant
      commander of the Great Lakes Division of the U.S. Naval Sea Cadet
      Corps and a Great Lakes ship captain.

      "What we are learning about the Great Lakes of several thousand years
      ago may change the way we think of this area," Clyburn said.

      Clyburn and other scientists have been filming in the Great Lakes for
      at least 25 years.

      There is a petrified forest in 40 feet of water in Lake Huron about
      two miles offshore from Lexington, he said. Some of the trees have
      been carbon-dated to indicate they are 6,980 years old.

      The Straits of Mackinac, a passage between lakes Michigan and Huron,
      have been spanned by the Mackinac Bridge since the mid-1950s but
      didn't exist several thousand years ago, Clyburn said.

      "Lake Michigan was much higher than Lake Huron, and the two did not
      join as they do today at the straits," he said. But water from Lake
      Michigan seeped underground toward Lake Huron and the two bodies of
      water eventually became connected.

      Clyburn's current film focuses on a sinkhole in Lake Huron about two
      miles from Alpena near Middle Island. In prehistoric times, the
      sinkholes were on dry land. Native Americans lived near these
      sinkholes because they provided water, which attracted game, he
      said. © 2006 The Associated Press. All rights reserved. This
      material may not be published, broadcast, rewritten or redistributed.

      URL: http://www.msnbc.msn.com/id/16280930/
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