Heart Mountain, named after the heart-like shape formed by the rocks at its peak

Heart Mountain, formed entirely of Paleozoic limestone, is an example of the limestone-rich mountains of the Rocky Mountains Front Ranges. Heart Mountain is interesting because of the synclines and anticlines with many distinctive chevron folds that can be seen on either side of it.

Learn more about how folds and faults play an important role in locating and extracting fossil fuels.

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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