NEW YORK (TheStreet) -- It was a busy weekend for mergers and on CNBC's "Cramer's Mad Dash" segment, TheStreet's Jim Cramer looked at two of them Monday.

The first involved Encana's (ECA) - Get Report $7.1 billion acquisition of Athlon Energy (ATHL) .

Cramer, the co-manager of the Action Alerts PLUS portfolio, said Encana, which is largely focused on natural gas, is "quickly shifting" into crude oil. He said Encana targeted Athlon Energy because of its presence in the Permian basin, a region that is "incredible" because of the amount of oil there. 

"This is a great acquisition by Encana," he said. 

Another of the weekend's acquisitions involved Tibco Software (TIBX) , whose shares are currently up 21% after being taken over by private equity firm Vista Equity for $4.3 billion.

Cramer said Tibco's most valuable business segment, Spotfire, was likely what Vista Equity was after. Spotfire, the company's business analytics platform, seemed undervalued, he concluded. 

-- Written by Bret Kenwell in Petoskey, Mich.

Follow @BretKenwell