Bedrock Island in the St. Louis River, Jay Cooke State Park, Minnesota, USA

            Clad in lofty Eastern White Pine (Pinus strobus), Arbor Vitae (Thuja occidentalis), and Paper Birch (Betula papyrifera), this island is made of steeply dipping strata of the Paleoproterozoic Thomson Formation. About 1.8 Ga ago this unit began as mud and silt layers deposited in a crustal downwarp known as the Animikie Basin. Compressed and lithified into shale, siltstone, and graywacke, they later were folded, tilted, and transformed into slate and other metamorphic rock types. 

Now jutting out of the surging waters of the St. Louis River some 15 mi (24 km) upstream from its terminus in Lake Superior, this rock creates eddies and rapids that add powerfully to the sense of rugged North Woods grandeur.
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Taken in: United States / Minnesota / Thomson, City of (show map)

Taken on: June 22, 2008

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Sets appears in: • Natural History: Minnesota • Ortsinn: Landscapes & Localities more » • Overt Tree Worship • Phytophilia • Rivers & Other Streams • Rock Forms, Rock Formations • Structural Geology • Waterfalls & Rapids « less

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Camera: NIKON COOLPIX S4, 38mm, ISO 50 (more info) (hide info)

Camera:	NIKON COOLPIX S4
Focal Length:	38mm
ISO:	50
Flash:	Off, Did not fire
Exposure Program:	Program AE
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	Uncalibrated
Software:	Inpaint
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