Morphological analysis and evolution of buried tunnel valleys in northeast Alberta, Canada

► Subsurface geologic data documents the distribution of tunnel valleys in NE Alberta. ► Tunnel valleys fills comprise multistory, erosion- to succession-dominated deposits. ► Deposits reflect allogenic and autogenic controls due to a sequence of jökulhlaups. ► Tunnel valley systems evolved time transgressively. ► Evolution is in part related to substrate lithology and subglacial hydraulics.