What’s this garbage in my float bowls?

[JMD]

Took my edelbrock carb apart tonight to fill the bowls with fuel and to my surprise I found a nice pile of crud in both bowls. Truck was running fine before I pulled the engine, but I’m wondering if this is a sign that my tank is starting to rust. The junk was kind of a rust colored powder that wiped away easily. There was about a tablespoon in each bowl.
Everything fuel related was brand new last year except for the tank, which is original. I have a Russell in line fuel filter right before the carb and there was nothing in the screen. Any ideas where this crap came from?
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