The damage I'm seeing isn't like the web info I keep coming across, so that's the reason for my uncertainty as to a repair course. I've decided to take some pictures and will explain each below.
The first damage I describe as a "foundation gap" of around 2-3" deep by nearly 36" long.
Lastly, there is a crack just beyond the gap:
There you have it. I can't find anything on repairing this type of foundation separation/ decay damage and all I keep running across are cracks or small to moderate sized holes, so any advice would be greatly appreciated. Just to note, the separation only occurs at one end of my house and is about 36" long as I said. The rest of the foundation in other areas seems intact and not separated, plus there are no cracks. Any idea of the cause of this would be appreciated also so, if I can repair it, it doesn't happen again.
Thanks in advance, Bill Skype