Deposition and Sedimentation

At the time when a given stratum was being formed, there was beneath it another substance which prevented the further descent of the comminuted matter

Sedimentation is the deposition of sediments.

The Congo Basin is the sedimentary basin of the Congo River.

Hutton reasoned that there must have been innumerable cycles, each involving deposition on the seabed, uplift with tilting and erosion then undersea again for further layers to be deposited.

However, during the Late Cretaceous to the Paleocene (65-55 million years ago), the seaway had begun to recede, leaving behind thick marine deposits and a relatively flat terrain which the seaway had once occupied.

A point bar is a depositional feature made of alluvium that accumulates on the inside bend of streams and rivers below the slip-off slope.

They are most often formed by the deposition of sediment at the bottom of ice-walled channels within or beneath a former glacier.

The soils usually consist of clays, silts, sands, and gravels deposited during floods.

Barrier islands are commonly formed in long, narrow systems parallel to shorelines and are shaped by waves, tides, sediment movement, and sea-level change, which cause them to shift, grow, or erode over time.

Over millions of years, the Colorado River had flowed into the Imperial Valley and deposited alluvium (soil), creating fertile farmland, building up the terrain, and constantly moving its main course and river delta.