Detailed magnetic maps over three of the four Spavinaw Granite outcrops are presented. These combined with laboratory measurements of the direction and intensity of the permanent magnetization and susceptibility measurements reveal the relative importance of permanent and induced fields at short distances from the granite. An air magnetic survey at 675 feet above the granite indicates the elimination of permanent field effects at that height.The size of the air magnetic anomaly when compared with the magnitude of folding known to be present in the Spavinaw anticline suggests strongly that a petrologic contrast with accompanying susceptibility contrast exists in the basement here. This could readily be interpreted as evidence of the intrusive nature of a local igneous body forming the core of the anticline, although it does not afford evidence of the date of intrusion.

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