the story of the norber erratics. the story unfolds on a hillside in yorkshire large boulders of...
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![Page 1: The Story of the Norber Erratics. The story unfolds on a hillside in Yorkshire Large boulders of gritstone perch on plinths of limestone Together they](https://reader035.vdocument.in/reader035/viewer/2022081821/56649ccf5503460f9499ba15/html5/thumbnails/1.jpg)
The Story of the
Norber Erratics
![Page 2: The Story of the Norber Erratics. The story unfolds on a hillside in Yorkshire Large boulders of gritstone perch on plinths of limestone Together they](https://reader035.vdocument.in/reader035/viewer/2022081821/56649ccf5503460f9499ba15/html5/thumbnails/2.jpg)
The story unfolds on a hillside in Yorkshire
Large boulders of gritstone perch on plinths of limestone
Together they tell a story which has been 16,000 years in the making
![Page 3: The Story of the Norber Erratics. The story unfolds on a hillside in Yorkshire Large boulders of gritstone perch on plinths of limestone Together they](https://reader035.vdocument.in/reader035/viewer/2022081821/56649ccf5503460f9499ba15/html5/thumbnails/3.jpg)
Their exact location is here….
North of Austwick in the Yorkshire Dales National Park
The boulders are made of gritstone carried by a glacier
from the floor of Crummack Dale about 3 kms to the north
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The hillside was scoured by the ice revealing a
pavement of limestone
..on top of which, as the ice retreated, it
deposited its load of gritstone boulders
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For 16,000 years the limestone pavement has slowly weathered, dissolved by mildly
acidic rainwater ….
..except where it has been protected by the gritstone boulders lying on top
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Gritstone erratic
Plinth of limestone
Height of the pavement at the end of the Ice Age
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Gritstone erratic
Plinth of limestone
Height of the pavement today
Solutional weathering since the Ice Age
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How long can their plinths survive?
But …..