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Geological compass : ウィキペディア英語版
Geological compass

There are a number of different (specialised) magnetic compasses used by geologists to measure orientation of geological structures, as they map in the field, to analyse (and document) the geometry of bedding planes, joints, and/or metamorphic foliations and lineations.〔The Mapping of Geological Structures (Geological Society of London Handbook Series) () K. R. McClay〕〔Statistics of Earth Science Data: Their Distribution in Time, Space and Orientation ()
Graham J. Borradaile (Author)〕 In this aspect the most common device used to date is the analogue compass.
== Classic geological compasses ==
Classic geological compasses that are of practical use combine two functions, direction finding and navigation (especially in remote areas), and the ability to measure strike and dip of bedding surfaces and/or metamorphic foliation planes. Structural geologists (i.e. those concerned with geometry and the pattern of relative movement) also have a need to measure the plunge and plunge direction of lineations.
Compasses in common use include the Brunton compass and the Silva compass.

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