No survivors in Quebec sinkhole

No survivors in Quebec slide – The Globe and Mail.

The ancient ice age has taken its modern victims. Only the family’s golden retriever, tied outside to a tree, survived.

The article linked above describes the land left behind when  the inland Champlain Sea receded,  and how the clay shifted, creating the sinkhole. The clay itself is  well described in a Wikipedia  article. The link follows.

The Champlain Sea extended to the Upper Ottawa Valley. A map is available here:

Minor earth tremors, human drilling, and excessive rain and snow, are among the factors that can change the quality of the clay in an instant. I grew up in the Ottawa Valley, not knowing the land below could be so treacherous.

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