Ashstone Aggregate Multi-Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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At the posted coordinates you will find a plaque similar to this one. This plaque describes the geological features found here!
To determine GZ, obtain the following information from the plaque:
1. The outcrop was formed 423-42A million years ago.
2. The tectonic event happened 3B0 to 3E0 million years ago.
3. C = number of full stops on the plaque.
4. D = number of other rock types in the Canberra Formation x2.
5. F = the first numerical digit found on the plaque
Now GZ can be found at: S 35° 17.ABC' E 149° 10.DEF'
Checksum A+B+C+D+E+F = 40
Please BYO pen.
Additional Hints
(Decrypt)
Cbfg