Even the leading snowball proponent Hoffman agrees that the 350 thousand - year - long Gaskiers glaciation did not lead to global glaciation .
Glaciation was probably as intense as the late Ordovician glaciation .
Even the leading snowball proponent Hoffman agrees that the 350 thousand - year - long Gaskiers glaciation did not lead to global glaciation , although it was probably as intense as the late Ordovician glaciation .