1. DEPOSITION
Mr. DeMarco

2. Deposition:
-Process by which sediments are released or dropped from an erosional system.

3. Deposition occurs when the velocity of the water decreases.
*This occurs when the stream or river flows into a larger body of water.

4. Characteristics of the sediments:
SIZE
SHAPE
DENSITY

5. SIZE Larger particles will settle out first.
Dissolved materials may remain in solution.
1st
Last

6. SHAPE last 1st Spherical sediments settle out first, while
flatter sediments will settle out last.
last
1st

7. Higher density sediments settle out first.
last
GOLD
ALUMINUM

9. THREE TYPES OF SORTING:
What is sorting?

10. Sorting of Sediments Vertical Sorting:
the roundest, largest, and densest particles settle at the bottom of a layer, while flatter, smaller, less dense particles settle on the top (landslide, underwater landslides)

11. Largest Particles Medium Particles Particle Size (Calm Body of Water)
Smallest Particles
Small Particles
Medium Particles
Largest Particles

13. Graded Bedding: -Vertical layering, largest sediments towards bottom.
-Occurs when an erosional system stops abruptly.

14. Graded Bedding picture:

16. Can be many “events” of abrupt stopping in one sample.

17. f05_18a_pg92
f05_18a_pg92.jpg 17

20. Windward side
Leeward side

21. How can I remember which way is horizontal?
HORIZONTAL SORTING
How can I remember which way is horizontal?
horizon

22. HORIZONTAL SORTING
Stream enters a large body of water, the velocity decreases and deposition occurs
Larger sediments are deposited first
Delta may form

23. HORIZONTAL SORTING
-Larger, more dense sediments settle out first, with a decreasing sediment size horizontally
-Occurs when the velocity of the water erosional system decreases slowly (such as a stream flowing into an ocean)
-Sediment size decreases in the direction the erosional system was flowing.

25. River Mouth – Water velocity decreases
Types of Deposition
Horizontal Sorting
River Mouth – Water velocity decreases

26. Deposition will occur on the inside of a meander where the water is moving more slowly

27. Inside bend–
deposition
creates a
point bar
(beach-like)
Outside bend-
erosion creates
a cut bank
(steep slope)

32. Alluvial fans form when streams come out of mountains onto flat land – velocity slows and deposition occurs

34. UNSORTED GLACIAL DEPOSIT

35. Types of Deposition Unsorted – Associated with glacial deposits