Indiana Jones unearthed box office gold at domestic theaters with a performance that puts the film on track to become the second biggest Memorial Day movie opening ever, according to studio estimates Sunday.

The fourth installment of the whip-cracking professor's exploits, "Indiana Jones and the Kingdom of the Crystal Skull," grossed an estimated $101 million from Friday to Sunday, plus $25 million from its opening Thursday, distributor Paramount Pictures said. The company expects it to earn another $25 million today.

That would put it behind only "Pirates of the Caribbean: At World's End," which had a Friday-through-Monday total of $139.8 million, in the pantheon of Memorial Day weekend blockbusters.

Disney's action sequel, "The Chronicles of Narnia: Prince Caspian," slipped to second place with $23 million, for a total of $91.1 million over two weeks.

Marvel Studios' "Iron Man" clinched another $20.1 million, bringing its domestic total to $252.3 million. A sequel is set for release in 2010.