Duration and nature of the end-Cryogenian (Marinoan) glaciation
Duration and nature of the end-Cryogenian (Marinoan) glaciation
Abstract The end-Cryogenian glaciation (Marinoan) is portrayed commonly as the archetype of snowball Earth, yet its duration and character remain uncertain. Here we report U-Pb zircon ages for two ash beds from widely separated localities of the Marinoan-equivalent Ghaub Formation in Namibia: 639.29 ± 0.26 Ma and 635.21 ± 0.59 …