The black side has been broken for a while and has oxidised/gotten grubby, the silver side was holding together until it went exposing fresh metal.
I would have noticed if there were any visual signs of a break large enough to let dirt in to this extent before total failure occurred. The dirt is from the crank arm being exposed to the road following my fall.
@tooth78 started
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The black side has been broken for a while and has oxidised/gotten grubby, the silver side was holding together until it went exposing fresh metal.