Ranges of download divided and split by bits (9)
I believe the answer is:
dolomites
'bits' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for dolomites that I've seen before include "mountains" , "Mountain range" .)