Crossword Genius

Ranges of download divided and split by bits (9)

Ross

I believe the answer is:

dolomites

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Sydney Morning Herald.
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