(Close): US markets retreated on Monday, giving up some of last week's big gains when strong jobs figures boosted sentiment.
The Dow Jones fell 0.5% to 18,105 points, while the S&P 500 index also lost 0.5% to 2,105 points.
The technology-focused Nasdaq ended the day down 0.2% at 4,993 points.
"It's a day of digestion after big news and a big move on Friday," said Eric Wiegand, senior portfolio manager at US Bank Wealth Management.
Declines gained momentum after the eurozone finance ministers ended their meeting in Brussels with Yanis Varoufakis of Greece warning that his country's financial situation was "terribly urgent".
Brent crude fell 48 cents to $64.91 in London, while US crude fell 14 cents to $59.25 a barrel in New York.
The fall in oil prices hurt energy stocks, with Exxon Mobil losing 2.5% to $86.78 - making it the biggest faller on the Dow.
Shares in petroleum company Rosetta Resources jumped 27% after it agreed to be bought by Noble Energy.
Noble's shares fell 6.2% after it said was paying about $2bn for Rosetta.
Meanwhile, shares in online retailer Zulily rose 5.1% after Chinese e-commerce group Alibaba said it had increased its stake in the company to 9.2%.
