The Virginia Dale Precambrian ring-dike complex, at the extreme south end of the Laramie Range, was first recognized by W. A. Braddock in 1962 from high-altitude air photos. This roughly circular feature is well expressed on 1957 early side-looking airborne radar (SLAR) imagery, from which in 1965 it was independently noted as a striking geomorphic (domal) anomaly. This particular imagery example illustrates the notable potential of radar imagery in general for delineation of larger scale elements, especially lineament patterns.

The Virginia Dale complex is believed by the current authors to be of particular significance, not only for its relevance to Precambrian history, but also for possible influence on Phanerozoic events here, and in particular for its possible bearing on location of the Ferris-Aultman and other associated Paleozoic diatremes.

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