The Guyanese left-hander needed lengthy treatment, but opted to continue and despite losing Powell, who was bowled by Lee for three, he reached his 18th Test century off 259 balls with a straight drive off Clark.
At the last hole his drive finished on Granny Clark's Wynd, the road crossing the fairway, but he hit his second off the tarmac to six feet and made it for yet another birdie.
He hit a beautiful cover-drive for four off Stuart Clark but then, attempting to hit an innocuous delivery through midwicket, turned his wrists too soon and the ball caught the back of his bat before being taken comfortably by Matthew Hayden at slip.