On some Perched Blocks and associated Phenomena

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Abstract
It is important to record any facts which may throw light on the conditions which prevailed immediately after the age of extreme cold which is commonly spoken of as the Glacial Period. In the north of England round the Lake Mountains we have many opportunities of examining details where the physical geography is so marked that we may often feel considerable confidence in the interpretation we put upon some of the facts observed. But even there we meet with curious phenomena upon the exact explanation of which we cannot yet with safety insist. Among these is the manner of occurrence of certain perched blocks. Perched blocks we will define to be masses of rock placed in more or less elevated positions at which they could not have arrived by any of the ordinary operations of nature now in action in that locality. We wish by this to exclude all “tumblers” or masses which have fallen from the cliffs above, such as the “Bowder Stone,” in Borrodale, and also rocks trundled along by the mountain-torrents, which often in storm are swollen to the size of great rivers and leave small deltas of loose material or isolated blocks in positions we should never believe them capable of reaching as we watch the silvery trickling thread of water in fair weather. Some perched blocks may have been dropped off the margin of glacier-ice; some may have been floated on coast-ice or bergs. Among the perched blocks there are some, too, which all would

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