The Breadknife volcanic dyke

The Breadknife

The Breadknife is a volcanic dyke in New South Wales, Australia. It is nearly 850 metres high, but often is only 500 m wide, which is particularly rare. The Breadknife was part of a large shield volcano, that first erupted about 17 million years ago and stopped about 13 million years ago. A huge shield-shaped volcano formed as volcanic explosions occurred over millions of years. This shield volcano rose about 1,000 m and is now largely eroded, forming the Warrumbungles.^[2] The Breadknife was formed when hot magma spread through a soft rock. When the magma solidified and became harder than the soft rock, erosion exposed a dyke.

• http://en.wikipedia.org/wiki/The Breadknife