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Aerial view of Rock
Lake.
Photo by Jack LeTourneau |
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Underwater structure
at 20 feet, western quadrant of Rock Lake.
Frank Joseph, 1992 |
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Digital
image of underwater pyramid.
Archie Eschborn/Jack LeTourneau |
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Enormous
Delta Mound in Rock Lake.
Aerial photo by Jack LeTourneau |
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Computer
enhanced close-up of Delta Mound.
Jack LeTourneau |
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Side scan
sonar image of headless man and turtle effigy mounds.
Frank Joseph, 1992 |
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Master
Diver, Maria LaBianco, with Researcher, Matthew Olson, examine
surrounding geological rock samples to help determine the age of the
underwater structures.
Keith Pamper |
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Expedition
Team Leader, Archie Eschborn, with Captain Clark Willick, examine
sonar side scan "towfish" aboard sonar vessel.
Keith Pamper |
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Operations Vessel, RV Tyranena I, of the Rock
Lake Research Society preparing for sonar and dive expedition.
1998 –2002
Keith Pamper |
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New techniques
for marking sites to investigate were developed by Expedition
leaders Archie Eschborn and Jack LeTourneau with Helicopter Pilot
Len Busch in April 2002. The helicopter hovered over promising sites
while Rock Lake Research Society boats marked the spots with GPS for
later investigations. |