Strange phenomenon - The mysterious forest rings of northern Ontario [View All]

[OneBlueSky]

http://www.cbc.ca/news/background/tech/science/forest-rings.html


An Ontario Geological Survey map of documented forest rings in Northern Ontario. Note that the size of the rings on the map is to show the distribution of different-sized rings, they are not proportional to the map scale. (Courtesy Ontario Geological Survey)

by Elle Andra-Warner
CBC News
May 21, 2008

It is a strange phenomenon: thousands of large, perfectly round "forest rings" dot the boreal landscape of northern Ontario.

From the air, these mysterious light-coloured rings of stunted tree growth are clearly visible, but on the ground, you could walk right through them without noticing them. They range in diameter from 30 metres to 2 kilometres, with the average ring measuring about 91 metres across. Over 2,000 of these forest rings have been documented, but scientists estimate the actual number is more than 8,000.

What causes these near-perfect circles in the forest?

Since they were discovered on aerial photos about 50 years ago, the rings have baffled biologists, geologists and foresters. Some explanations put a UFO or extraterrestrial spin on the phenomenon. Astronomers suggest the rings might be the result of meteor strikes. Prospectors wonder whether the formations signal diamond-bearing kimberlites, a type of igneous rock.

- more . . .

http://www.cbc.ca/news/background/tech/science/forest-rings.html


The R2 Ring is a 300-metre wide ring located about 40 kilometres south of Hearst, Ont. The geological source of the ring is unknown, but its shape can be clearly seen in this aerial photograph of the forest. (Courtesy S. Hamilton, OGS)