Stream channels and point bars are more “active” depositional sites. Stream channel deposits may have pebbles and cobbles whereas sediments on the adjacent point bars are normally composed of sand. Typical sedimentary structures include small dunes and ripples. Explain the consistent difference in grain size between channel and point-bar sediments.

Stream channels and point bars are more “active” depositional sites. Stream channel deposits may have pebbles and cobbles whereas sediments on the adjacent point bars are normally composed of sand. Typical sedimentary structures include small dunes and ripples. Explain the consistent difference in grain size between channel and point-bar sediments.