Beachgoers urged to not disturb creatures exposed by ultra\u002Dlow tide
It’s no ordinary rock, according to Edwin Nissen, University of Victoria professor of ocean and earth sciences. It most likely travelled — via glacier — hundreds of kilometres from the Coast Mountains north of Vancouver between 10,000 and 20,000 years ago.
The constant flow of the glacier would have ripped up rocks and transported them in the ice, eventually depositing them randomly when the glacier melted, as the era of massive glaciers came to an end.Article content The crystallized igneous rock isn’t the only reminder of historic glaciers along the region’s shorelines. Nissen notes that glacial striations — basically, scratch marks left by tough igneous rocks along the softer bedrock — reveal the north-south flow of the ice.
“Twenty thousand years or 10,000 years ago, whenever these glaciers were flowing and retreating, is a blink of the eye in geological terms,” he said. “The earth is 4.5 billion years old and a lot of the rocks we see here are tens or hundreds of millions of years old.” “They’re rare but not unexpected,” Dewey said. “They often come together this time of year and particularly during summer solstice.”“Often we think about high tide and low tide as being about six hours apart, but on Wednesday, we had one very low tide at mid-morning and high tides were at midnight.”With the sun and moon exercising their full power over B.C.’s south coast, the usually underwater worlds of vegetation, shellfish, crabs and other intertidal species are also exposed to the sun.
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