In applying geophysical data for geological interpretation, some considerations should be done by both geophysists and, geologists. The writer tried some discussions on this problem and as conclusions, he proposed following shemes. i) General meaning of field observation data, ii) Correlelation between observed value and its corresponding lithology, iii) Geophysical meanig of observed value by referring physical properties= of rocks, iv) Variation in physical properties of rocks with complicated circumstances in nature.
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