Standard & Poor's has raised the credit ratings on about $16 billion of debt of BankAmerica Corp. and its affiliates.

The rating agency said the San Francisco-based bank had emerged as a "very clear leader" in its markets in the western half of the United States. The agency also said the "dislocations" from integrating the operations of Security Pacific Corp. and Continental Corp. had temporarily retarded revenue growth but that the bank was regaining momentum.

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