Crop circles are areas of plants flattened (usually) into recognizable designs--most often found in fields of growing cereal crops (wheat, barley, oats, rye, etc.). They also occur in corn (maize), grasses, reeds and all sorts of vegetables, and sometimes--according to the scientific plant data available--these more randomly-downed (no discernible pattern) areas contain the same plant abnormalities as have been documented in genuine "geometric" formations. Crop circles are occurring, as best we can tell, all over the world, with the modern "flap" having been first noted in the England in the 1970s--and there is documentation indicating they occurred and were reported as early as the 17th century.

Although some modern crop formations are known to have been mechanically-flattened by people, scientific research
published by the BLT Research Team in the 1990s has established plant & soil abnormalities which cannot be caused by "pranks with planks".
For details call 617 492 0415 or go to http://www.bltresearch.com.

Crop Circles in the USA most often occur on PRIVATE PROPERTY
- Permission from the owner or farmer is required to enter -

2013:

Gray, TENNESSEE -   May 13, 2013   (hayfield)
In rural N/E Tennessee (nr.Johnson City, just S. of VA border), 2 partial rings (”half-moons”), each encircling small circles & connected by path–reported as showing no footsteps/tracks into field when found.  In same town a “40-50 lb” chunk of white “meteor ice” fell 3 days earlier–creating a 1-2 ft. diam., 4-6 inch deep crater. (??)