What's going on here? Terminal screen pops up after installing Mountain lion.

I installed mountain lion yesterday! all looked like it was working well. Just now I rebooted my iMac. The first thing I see on my computer is that it booted up in terminal mode! I have white lettering on black background with a lot of lines of text. At the end of many lines of text there is a copyright Regentss of the university of California."? Than it goes on with " MAC Franework successfully initialized."
The text goes on until " Root device is mounted read-only." than it ask if i want to boot system enter exit & hit return.
Anybody know what's going on here. I have never experienced this in my many years as a Apple enthusiasts!
I need some clarification

You're in single-user mode. Type the word "exit" and press return to get out of it. If it happens again, reset the PRAM.
Resetting your Mac's PRAM and NVRAM

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