What is a Shoreface deposit?
Shoreface/Beach: A deposit of unconsolidated sediment extending from low tide to a topographic break such as a line of dunes or cliffs.
How is the Shoreface formed?
In shallow water, the oscillatory flow of water induced by passing waves becomes asymmetric, with short relatively strong landward flow under the crest of a wave and a more prolonged weaker, seaward flow under the trough. This orbital velocity asymmetry drives sediment in a landward direction, building the shoreface.
How deep is the lower Shoreface?
The lower shoreface, with water depths between about 8 and 20 m, forms the transition between the inner shelf and upper shoreface.
What does marginal marine mean?
The Marginal Marine is dominated by wave, river and tidal processes. The characteristics of Marginal Marine are high-energy waves and currents, although some lagoonal and estuarine environments are dominated by quiet-water conditions.
What is continental depositional environment?
Continental Environments Continental depositional environments are dominated by clastic sedimentary rocks, largely because of their proximity to the source of the sediments. Glacial depositional environments are controlled mostly by the weathering and erosion by glaciers and glacial meltwater.
What is beach profile in geography?
A beach profile shows the cross-sectional shape of a beach, usually from the edge of the sea to the base of the cliff. To create a beach profile follow a straight transect line from the edge of the sea to the end of the active beach. Split the line into sections where the slope angle changes.
What is meant by depositional?
2 : an act or process of laying someone or something down or letting something fall : an act or process of depositing the deposition of earth and stone by glaciers. 3 : something deposited : deposit Moraines are glacial depositions.
What are four depositional environments?
Types of depositional environments
- Alluvial – type of Fluvial deposit.
- Aeolian – Processes due to wind activity.
- Fluvial – processes due to moving water, mainly streams.
- Lacustrine – processes due to moving water, mainly lakes.
Which depositional environment did the upper shale likely form in?
Shales are often found with layers of sandstone or limestone. They typically form in environments where muds, silts, and other sediments were deposited by gentle transporting currents and became compacted, as, for example, the deep-ocean floor, basins of shallow seas, river floodplains, and playas.