Sentences with phrase «from cinder cone»

Among one of the few in the world, the green sand comes from the deposit of lava called olivine, from a cinder cone called

Not exact matches

In fact the argon dates suggested that roughly 50 million years ago in the Eocene — when a warmer world of forests stretched from pole to pole and the ancestors of mammals such as bats, elephants and primates first evolved — cinder cone volcanoes dotted Virginia for a million years or two.

The island is dotted with craters, cinder cones, lava flows, spatter cones and broken lava tunnels which run down from the summit.

Volcanic cinder is also quarried from nearby cinder cones and used as highway aggregate.

(Definition of a cinder cone: a «steep conical hill of tephra (volcanic debris) that accumulates around and downwind from a volcanic vent.»)