glacial

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Glaciation

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The initial page, Hopwood deals with a local area and the effects of erosion by running water. I expect to add comments on Postglacial Materials shortly, since the local area has a heavy cover of glacial drift. There are bedrock outcrops in the clough, but they are hard to spot.

Glacial erosion

Unlike river erosion, most of the valley surfaces of a glaciated valley are actually in contact with it. The only exceptions being the frost shattered areas at the head of a glacier and those where it is still in a highland area.

Glacial deposition.

Again unlike a river or waterway a glacier does not sort the material it deposits underneath itself, where it is not actually scraping rock surfaces bare and striating them with embedded boulders.

Glacial "retreat"

Unless for some reason the supply of new ice is cut off a glacier always moves forwards. The ice front position may advance or retreat if ice supply exceeds or falls short of the rate at which the ice melts. There is no reverse motion.

This page PKM March 27th 2018 Revised March 29th 2018

This Page created originally Updated 28th March 2018

Glacial erosion	Unlike river erosion, most of the valley surfaces of a glaciated valley are actually in contact with it. The only exceptions being the frost shattered areas at the head of a glacier and those where it is still in a highland area.
Glacial deposition.	Again unlike a river or waterway a glacier does not sort the material it deposits underneath itself, where it is not actually scraping rock surfaces bare and striating them with embedded boulders.
Glacial "retreat"	Unless for some reason the supply of new ice is cut off a glacier always moves forwards. The ice front position may advance or retreat if ice supply exceeds or falls short of the rate at which the ice melts. There is no reverse motion.