One of the advantages of examining old rocks of glacial origin is that they are commonly well exposed. On Ella Ø in central East Greenland, folding of the Late Proterozoic glacial rocks has tilted them up on end, so one can follow a stream course and work progressively up or down through several hundred metres of glacial strata. These rocks bear many of the hallmarks that have led to the generation of the ‘Snowball Earth’ hypothesis of global glaciation. MH