The development of Mount Waesche began in the Pliocene, and Plio-Pleistocene tephra layers found in the Southern Pacific Ocean may originate at Mount Waesche. It appears that volcanism in the Executive Committee Range moved southwards over time, beginning at Mount Hampton and eventually arriving at Mount Waesche which is the young volcanic centre of the range. Chang Peak grew first, 1.6 million years ago or between 2.0-1.1 million years ago, while Mount Waesche formed within or about 1 million years ago; the youngest rocks at Waesche are less than 100,000 years old. Argon-argon dating on rocks that today form moraines has yielded ages of about 200,000 years to over 500,000 years. One flank vent has been dated to be 170,000 years old and some rocks are too young to be dated by potassium-argon dating.