The undated air-fall pumice deposit exists across the southwestern part of the Big Raven Plateau called Sheep Track Pumice or Sheep Track member. Pumice is a light volcanic rock full of air spaces and commonly pale in colour, ranging from white, cream, blue or grey, but can be green or black. The Sheep Track Pumice is mysterious because the vent of its origin is unknown, even though it is estimated from its state of preservation to be younger than 500 years. This pumice deposit emphasizes one of the significant volcanic hazards linked to the Mount Edziza volcanic complex - the likelihood of a violent explosive eruption. The volcano that produced the pumice might be covered by glacial ice. Collaborators at the University of British Columbia have started work on samples collected from deposits of Sheep Track Pumice.