The only exception to this north rule occurs where strike is exactly east-west.
A typical bearing is given, for example, as N 45 ° E, which is a shorthand notation for a bearing that is 45 degrees east of north (or half way between due north and due east). According to convention, the compass direction (or bearing) of this line is always measured and referred to relative to north. The intersection of two flat planes is a straight line, and in this instance, the line is geologic strike. Strike is defined as the compass direction, relative to north, of the line formed by the intersection of a rock layer or other planar feature with an imaginary horizontal plane. The method involves measurement of strike and dip of the rock layers or planar features.
Geologists use a prescribed method of determining the attitude (or orientation in three-dimensional space ) of rock layers or any other planar geological feature (e.g., metamorphic foliation, fractures, faults, and tops of tabular units like formations).
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