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The Gorges d'Héric
At location 9 the road swings round
to the left. On the inside of the bend we can see a familiar rock
type. It is cleaved with flat surfaces with striations similar to
the .1cm x 4 cm regular micro folds of location 1.
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close up of the crenulations
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| Planar jointing and cleaved planes
with crenulation folds suggest a pocket of low grade metamorphism |
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Size and shape
The rocks are jointed into 1-5m cubic
shapes. Either these rock have been protected from the high pressures
and or high temperatures suffered by the rest of the rocks, or we
have passed through the High metamorphic zone to a lower one. Only
an examination of the surrounding rocks can decide, and the "strain
shadow" explanation seems more likely.
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