Limestone quarry along Highway 1 west of Calgary at Lac des Arcs

Calgarians are fortunate to have an abundant supply of aggregate nearby, to use for construction and road materials. Many other cities have to import aggregate from great distances. At Lac des Arcs (Gap Lake), limestone is quarried and mixed with sandstone and shale, then ground, burned in kilns, and treated with gypsum to form cement.

Learn more about Calgary's mineral resources

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Legend

	Holocene	Present - 10,000 years ago
	Quaternary	10,000 - 25,000 years ago
	Tertiary	25,000 - 65 million years ago
	Mesozoic	65 - 245 million years ago
	Paleozoic	245 - 670 million years ago