In a rare tie, reigning champ "Transformers: Revenge of the Fallen" and the new cartoon "Ice Age: Dawn of the Dinosaurs" shared the top spot at the holiday weekend box office in North America.

According to studio estimates issued on Sunday, the movies each sold about $42.5 million worth of tickets during the three-day U.S. Independence Day holiday weekend.

But "Ice Age: Dawn of the Dinosaurs," the third movie in 20th Century Fox's family franchise, was clearly the top pick on a worldwide basis. It earned $148 million from 101 foreign markets, which the News Corp-owned studio said was the sixth-biggest opening overall.

Including its North American tally of $67.5 million since opening on Wednesday, the global total stands at $215.5 million.

Paramount's "Transformers" sequel earned $55 million from 62 markets during its second weekend, taking the foreign haul to $298 million. The global total stands at $591 million, taking the robot sequel past Columbia Pictures' "Angels & Demons" ($474 million) to become the biggest film of the year.

In North America, the lucrative summer season is 5 percent ahead of last year's record-setting haul in terms of ticket sales with $2.3 billion banked so far, said industry analyst Paul Dergarabedian, president of Hollywood.com Box-Office. But he doubted the number of tickets sold (currently 319 million) would exceed the modern record of 653 million set in 2002.

He said it appeared to be unprecedented for two films to be tied, but noted that an eventual victor will be determined on Monday, when the studios release their final data.

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