The coarsest materials, pebbles, cobbles, and boulders, were deposited near the glacier, and the finer materials, sand, silt, and clay, were carried successively farther away from it.
(The coarsest materials, pebbles, cobbles, and boulders; were deposited; near the glacier) (the finer materials, sand, silt, and clay; were carried; successively farther away from it)
The coarsest materials, pebbles, cobbles, and boulders the finer materials, sand, silt, and clay
were deposited were carried
near the glacier
successively farther away from it