i'm curious as to its name and what caused it. looks like an old impact site or a crater, but it is the first nearly circular terrain feature that I have noticed.
2006-07-10 06:51:54 · 3 answers · asked by carldooley 1 in Science & Mathematics ➔ Geography
http://en.wikipedia.org/wiki/Manicouagan_Reservoir
2006-07-10 06:58:16 · answer #1 · answered by WyattEarp 7 · 2⤊ 0⤋
That's the Manicougan Crater / Reservoir, Quebec. The impact event is dated as Late Triassic.
It really wasn't recognized as a crater until the 1960s, after Hydro Quebec created the reservoir (damming the Manicougan and aux Outardes rivers). The flooding greatly accentuated the circular aspect of the feature.
If you ever fly from London to Chicago, you'll pass directly over it.
There are many circular geological features that are visible on satellite imagery (or a composite like Google Earth). Most are simple plutons, a few qualify as bona fide calderas, and impact craters are the rarest of the lot.
2006-07-10 15:05:23 · answer #2 · answered by Wally 2 · 0⤊ 0⤋
Could have been a volcanic caldera.
2006-07-10 13:57:43 · answer #3 · answered by ag_iitkgp 7 · 0⤊ 0⤋