221950ring

weird ring (overlay)

The entire area is the Air and Tenere Natural Reserve in Niger. The overlay image shows some solid circles cover up several Precambrian volcano craters. The weird thing is a huge " ring gap" cuts through the Air Mountains , just like a vestige of a cup presses into sand upside down.

Geologists say that the 63km-length diameter ring is called " ring dike",also the biggest ring dike in the world, their concentric or radial geometric distribution around a centre of volcanic activity indicates their sub-volcanic origins.

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