what is canada's oldest mountain range
It is believed that the oldest mountain range is the Appalachians.  They formed during the Ordovician Period which occurred about 480  million years ago. The Appalachians ru â¦ n for 1,500 miles and the  highest peak is 6.684 feet.uch research has been done in the St. Francois mountains of South East Missouri. They have been considered the oldest range by many geologist. Volcanic episodes created many unique, beautiful, and odd formations throughout this mountain range which is located within the Ozark Plateau.