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manicouagan

Above is the best (or the widest) shot I could get of Lake Manicouagan, which is the largest visible impact crater on Earth. Only three (or maybe four) are larger and none are visible.

The Manicouagan impact event happened about 214 million years ago, give or take. That was 14 million years before the end of the Triassic, which was first of the three “dinosaur ages” of the Mesozoic, an era that came to an end with the Chicxulub impact. Coming that far in advance the Manicouagan event  may not have been to blame for a mass extinction, but it wouldn’t have been pleasant.

There are better photos in the series, but it was a hazy day and the one above does the best job of showing the crater’s edges.

I’ve been wanting to see (and shoot) Manicouagan for many years, but routes and weather had never obliged before. This time they did, which was cool.

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So I shot a bunch of pictures of Niagara Falls from 35,000 above, on a trip last week from San Francisco to Boston. Click on the pic for the whole set.

Interesting to think that the falls are only about ten thousand years old. A blink in geologic time.

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Not long ago as geology goes — nine, ten, twelve millennia — one of the world’s largest lakes covered most of Minnesota, plus much of North Dakota, Manitoba, Saskatchewan, Ontario and a corner of South Dakota. It’s called Lake Agassiz, named after the scientist Louis Agassiz, who figured out the Ice Age (continental glaciation, basically), and whose statue dropped head-first into the concrete in the 1906 earthquake.

Evidence of the late lake s not obvious unless you look in winter, from altitude. I did that while flying west the week before last. Here’s the photo set I shot. Those lines you see in the farmland are old shorelines of the lake. Since it was a glacial lake — a large puddle left by the effect of global warming on the ice cap — these lines I suppose also qualify as glacial moraine. Anyway, interesting shit. To me, at least.

By the way, the straight lines in the shot above are wind breaks made of trees or hedges. (Not sure.). The larger square or rectangular dark areas are woodlots. The setting is a spot almost exactly where South Dakota, North Dakota and Minnesota meet. I believe it is in South Dakota.

By the way, what remains of Lake Agassiz is Lake Winnepeg, Minnesota’s ten thousand lakes (See this comment below for the correction, and a larger number scattered around three provinces of Canada.

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