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Answer:
They are often formed in different environments, but the main difference is in appearance. Below are the main differences:
- Conglomerate consists of mostly rounded fragments; Breccia consists of mostly angular fragments
- Conglomerate is often formed as a result of a large flash flood; Breccia is often formed as a result of a turbidity current (where fragments are tossed around in a high energy marine environment where they tumble down a slope, landing randomly in a heap)
- Conglomerate can contain very large fragments: consider the size of pebble on a river beach, or indeed on a pebble beach by the sea. Breccia tends to contain more gritty-type fragments.
- In terms of processes prior to their burial; fragments in conglomerate tend to have been tossed around and eroded for far longer than those in Breccia. For Breccia, it may be as simple as a fragment falling loose from a cliff face, then falling to the beach, where it is quickly swept into the sea and rolls to the bottom. From this, we can say that conglomerate fragments have been eroded for millennia, but breccia fragments may only have spent a decade or so above the surface.
First answer by Acchilles.
Last edit by Acchilles.
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