claim: Cordilleran Ice Sheet was a minor ice sheet.
evidence: Johan Grimonprez -LRB- born 1962 -RRB- is a Belgian multimedia artist , filmmaker , and curator .. He is most known for his films Dial H-I-S-T-O-R-Y and Double Take .. Dial H-I-S-T-O-R-Y. Dial H-I-S-T-O-R-Y. Double Take. Double Take ( 2009 film ). As of 2014 , Grimonprez 's upcoming projects include the feature films How to Rewind Your Dog and Shadow World  : Inside the Global Arms Trade , based on the book by Andrew Feinstein .. Andrew Feinstein. Andrew Feinstein