Dow slips 329 points as earnings-season worry creeps over the market

· *US stocks slid on Monday in their first day of trading after the S&P 500 completed its best weekly gain since 1974.*
· *Investors mulled heightened uncertainty heading into earnings season. *
· *JPMorgan, Wells Fargo, and Johnson & Johnson are among the firms set to announce their first-quarter results on Tuesday. They'll...