Mesozoic sandstone shown thrust to the surface in the Foothills along Highway 1 west of Calgary (Photo: A. Sweet)

Mesozoic (Cretaceous) sandstone seen here thrust to the surface in the Foothills along Highway 1 west of Calgary is the source of much of Alberta's oil and natural gas.

Learn more about Alberta's tropical past and how our fossil fuels were formed.

Click on a dot to continue the tour:

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