Mystery partition after boot camp fail

I'm on an iMac, OSX 10.10.1. The entire 3TB Fusion HD was a single partition.
I attempted to install Windows using the Boot Camp Assistant, but Boot Camp froze while partitioning the HD. After rebooting, my HD now has a second Macintosh HD partition (~800GB) with a bunch of files in it (which I can't access), and which I'm unable to modify or remove using the Disk Utility (both in OSX and Recovery).
And of course, my HD now shows only 2.3TB.
Is there any way to resolve this short of reformatting the HD? And if that's necessary, any tips on how to go about doing that, plus reinstalling the OS and my Time Machine backup (I'm new to Macs, so I'm a little unfamiliar).
Thanks in advance.
Jed

Thanks for the quick response, Eric.
When I get to this step -- "Select the top level hard drive, not one of the partitions (as shown in screen shot)" -- the only option I have is to select the partition, not the entire HD. Note in the screenshot, the capacity is 2.3TB, which is only one partition of the two.
If I try to select the entire HD, I don't have the option to erase.
(These screenshots are from Disk Utility in OSX, not the Recovery one, but that's just so I could get a screenshot of what I saw in Recovery).
If I click to Erase, it notes that I'm only erasing the one partition. If this will, in fact, reset the drive to a single partition, I'll go ahead and do it, but I'm hesitant to reformat and reinstall if I don't have to.
It appears this might be a result of the way the Fusion drive operates combined with Bootcamp. Looking at this thread, there's a possible solution, but before I take that step, another new-Mac-user question -- is the reinstallation of the OS pretty reliable? Meaning if I go crazy with formatting things, am I always going to be able to reinstall the OS as long as I have a Recovery partition or have an Internet connection to do the Internet Recovery?
Thanks,
Jed

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I'm trying to create a Windows partition using Boot Camp. An error comes up telling me that I need to reformat my current partition(s) into one single partition. However, it's already formatted in the correct format, and is already a single partition.
My computer recently had a kernel panic, which apparently the corruption was in the system and needed to be erased and re-installed. I have a complete back-up using an external hard drive, and I am definitely not willing to do another one of those to reformat a partition that is already singular. I restarted the computer after ejecting my back-up, and after turning off time machine (thinking that boot camp was recognizing it as a secondary partition), however the error still occurs.
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   0:      GUID_partition_scheme                        *750.2 GB   disk0
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   2:                  Apple_HFS Macintosh HD            749.3 GB   disk0s2
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Mystery partition after boot camp fail

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