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Indexed under : Earth Sciences

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Mima mounds

Mima Mounds are low, dome-like, roughly symmetrical natural mounds on terrestrial terrain - mainly composed of loose, unstratified, often gravelly sediment. They have a diameter of 3 to 50 m, and a height of 0.2 to 2 m.

They are found mainly in the northwestern United States - though similar structures have also been found on every continent except Antarctica. They sometimes occur in groups of thousands.

After 150 years or so of research, there are now several theories to explain their origins - none of which has been generally accepted.

As their construction tends to vary, it's currently thought that different mounds may have differing origins.

The main theories are that they were formed by ;

  • Gophers
  • Wind
  • Seismic activity
  • Clay expansion/contraction
  • Termites, ants, rodents and plant roots
  • Glacial flooding

See : BBC Earth


Also see : Drumlinsplugin-autotooltip__plain plugin-autotooltip_bigDrumlins

"Drumlins are elongated hills of glacial deposits. They can be 1 km long and 500 m wide, often occurring in groups. A group of drumlins is called a drumlin swarm or a basket of eggs, eg Vale of Eden.[UK]

Source : BBC Glacial Depostion"

They are formed from …


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