Two guest lecturers will discuss geological issues in southeastern Idaho as they relate to the Teton Dam disaster of the mid-1970s on April 4 at Brigham Young University.

Glen Embree and Roger Hogan, both from Ricks College in Rexburg, Idaho, will present a combined lecture at 4 p.m. in 255 Eyring Science Center. Their topics will be "Secondary Flow and Mass Movement in the Huckleberry Ridge Tuff" and "Subjacent Units and its Relationship to the Failure of the Teton Dam." The lecture is free to the public.The Teton Dam, on the Snake River near Rexburg, gave way in the mid-1970s, causing severe damage to communities of southeastern Idaho.