claim: There was a major ice sheet called Cordilleran Ice Sheet.
evidence: Ian McFarland is an American musician , director , and producer of music videos .. He was a bassist for the hardcore punk group Blood for Blood from 1997 to 2004 , and then turned to film making as a career .. bassist. bassist. hardcore punk. hardcore punk. Blood for Blood. Blood for Blood. He produced and directed Meshuggah 's 2010 concert film Alive , and the music video for Killswitch Engage 's Grammy-nominated 2013 song In Due Time '' .. music video. music video. Meshuggah. Meshuggah. concert film. concert film. Alive. Alive ( Meshuggah video ). Killswitch Engage. Killswitch Engage. Grammy-nominated. Grammy Award for Best Metal Performance. In Due Time. In Due Time ( song )