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White Horse Bluff
White Horse Bluff is a subaqueous volcano in Wells Gray Provincial Park, east-central British Columbia, Canada.
==Geology==
About half a million years ago, the Clearwater Valley was filled by a lake backed up by a lava dam near Hemp Creek. White Horse Bluff is a complex volcanic formation that erupted underneath this lake. The outer lava cooled rapidly as it encountered the lake, then water percolated into the still-molten interior of the lava, initiating violent explosions. As the pile of debris grew, dykes fed more lava to the bluff. Subsequent erosion by glaciers and meltwater has exposed these dykes which give the impression that a giant hand has plastered gobs of lava onto the face.〔Neave, Roland (2015). ''Exploring Wells Gray Park'', 6th edition. Wells Gray Tours, Kamloops, BC. ISBN 978-0-9681932-2-8.〕〔Goward, Trevor and Hickson, Cathie (1995). ''Nature Wells Gray'', 2nd edition. Lone Pine Publishing, Edmonton, AB. ISBN 1-55105-065-X.〕
The Rock Roses are a unique collection of small columns. Unlike most formations of columnar basalt which are vertical like organ pipes, these are horizontal and the ends of the columns point out, rather like the tiles on a shower wall. About further west, the columns suddenly change direction and resemble the wall of a log house. The Rock Roses were formed by the molten lava in the dyke contacting the cooler and older adjoining rocks.〔
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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