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rocking stone
Rocking stones (also known as logan stones or ''logans'') are large stones that are so finely balanced that the application of just a small force causes them to rock. Typically, rocking stones either are residual corestones formed initially by spheroidal weathering and have been later been exposed by erosion or glacial erratics left by retreating glaciers.〔Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. ISBN 0-922152-76-4〕〔Twidale, C.R., and J.R.V. Romani (2005) ''Landforms and Geology of Granite Terrains.'' A.A. Balkema Publishers Leiden, The Netherlands. 359 pp. ISBN 978-0415364355〕 Natural rocking stones are found throughout the world.〔 A few rocking stones might be man-made megaliths.
==Name==
The word "logan" is probably derived from the word "log", which in an English dialect means to rock. In fact, in some parts of the UK, rocking stones or logan stones are called logging stones. The word "log" might be connected with the Danish word "logre", which means to "wag a tail".
Some have suggested that the word "logan" comes from a Cornish expression for the movement that someone makes when inebriated. Davies Gilbert writes:
:It may be observed that I have always used the words Loging Rock for the celebrated stone at Trereen Dinas. Much learned research seems to have been idly expended on the supposed name, "Logan Rock." To log is a verb in general use throughout Cornwall for vibrating or rolling like a drunken man; and is frequently heard in provincial pronunciation for tug, characteristic of the modem present participle. The Loging Rock is, therefore, strictly descriptive of its peculiar motion.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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