Is this mold

[Jmeng1026]

I was asked to inspect the structural components of a basement that flooded several years ago. The house has sat vacant for the last few years and now someone's trying to restore it.

While I was there I noticed along the bottom of the foundation wall there was a black line and the concrete had a whiter color to it below the line.

I was told the water flooded the basement up to the top of the concrete so the water was supposedly much higher than the black line.

Is the black line and whiter color concrete mold?

 

[swazimatt]

looking at that i would say the dark patch is the extent of the kicker for the wall when the poured floor slab