carboy yeasty trubby "rings"

Quick question, first time long-term conditioning in a secondary:

What are these rings that run along the inside ridges of the carboy? They look like the same kind of yeast/trub that is on the bottom, and encircle each ridge, almost like stratification layers or something. I have the same thing going on with my Lager at 39 degrees (this is a bourbon ale at 75).

Normal, I am sure, just curious why or how they form and if they will fall eventually. Not too concerned with this brew, but for the lager, I want some clairity.

Thanks!

As sediment drops out, some of it just tends to rest on those little ridges. It's the same stuff that's on the bottom. No big deal. It may or may not fall off.

Man, that looks infected. You better dump it out and start over!

Agreed. Send to me for proper disposal. Your carboys are probably infected as well. No worries, I'll take care of those as well.