Canada is comprised of three major physiographic regions: the Canadian Shield is
the country’s geological core and is comprised of igneous and metamorphic rocks
that are 1 to 4 billion years old; the Interior Plains sedimentary basin contains
deposits from terrestrial and marine environments that are 560 to 10 million years
old; and the Rocky Mountains, which were constructed by tectonic activity 170 to
55 million years ago.
Location 1 Cochrane: Bow River, 200m West of Highway 22
To access the location on the North bank of the river: head South on Highway 22,
turn right (West) on Quigley, turn left (South) on West Edge, turn left on West
Mitford, follow this road down until it reaches the river bluff – there is an open
area between the houses where you can walk to the edge of the bluff, you will see
a poorly defined trail leading down the bluff to the river, follow it down and turn
left (East) when you can, you will be roughly at river level, you may have to push
past a couple of bushes, but you will see the outcrop ahead of you.
This block of grey limestone has split in half to reveal a siliceous nodule. Why
is it such a strange shape? Originally, this was probably a shrimp burrow, known
as Thalassinoides – it was later infilled with siliceous fluid, which crystallised
and preserved the shape of the burrow.
Highway 1A & Range Road 60
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