 An undated pumice deposit exists throughout the complex estimated to be younger than 500 years.Kostal Cone in the Wells Gray-Clearwater volcanic field of east-central British Columbia is a cinder cone responsible for basaltic lava flows comprising a lava bed, damming the southern end of McDougall Lake.There has been activity at this site as recently as 7,600 years ago at Dragon Cone, though more likely less than 1,000 years ago.