codes used on GSNSW.gov radiometrics maps

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can someone tell me where to find the meaning of the symbols on radiometric and magnetic anomaly maps as pictured ? symbols are Ps, Psv , Cs , Cvu , Qa etc etc thankyou

 

[Diggerdude]

It's the rock type and age mate. Eg Qa is Quaternary alluvium, Ps is probably Permian sandstone. There will be a Legend attached to the map somewhere that should tell you, most are easy to guess.

DD