Ancient coin design?

WillieBoyd2

An Enigmatic Feature in Athabasca Lava Flows:



http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA18932

Sapyx

<< <i>The circular feature is nearly 2 kilometers (1.2 miles) wide. >>


That would make it an AE2000000, then.

I'm reminded of the Triganic ningi from Hitch-Hikers Guide to the Galaxy: a coin with a face value of 1/8th of a pu, but since a ningi was a giant rubber triangular coin 6800 miles per side, no-one had ever acquired enough ningis to own 1 pu.

STLNATS

<< <i>

<< <i>The circular feature is nearly 2 kilometers (1.2 miles) wide. >>


That would make it an AE2000000, then.

I'm reminded of the Triganic ningi from Hitch-Hikers Guide to the Galaxy: a coin with a face value of 1/8th of a pu, but since a ningi was a giant rubber triangular coin 6800 miles per side, no-one had ever acquired enough ningis to own 1 pu. >>



And the ningi wasn't convertible since the Galatic Bank didn't deal in piddling small change.

TIF2

It's Kushan



(image borrowed from Doug Smith)

Swampboy

Celtic imitative or perhaps an Athabaskan provincial

Dunno. Just guessing here.

Sapyx

Design-wise, it most reminds me of those Islamic pilgrim charms from Southeast Asia. Or maybe the shadow-puppet on the Japanese-occupied Indonesia 10 sen coins.