For the benefit of newcomers or otherwise, it think that it is important to realize that the coloured, contoured maps represent the response from an airborne magnetic survey. Hence, the oval, circular or other shaped bodies are indicative of the shape of bodies with different magnetic signatures, not necessarily "anomalies". The anomalies referred to by the prefrix "AT" represent conductors detected by various airborne electromagnetic surveys, including VTEM and have been superimposed on the mag maps.

Cheers

Have a great and safe weekend.

geoprof