Delta

Question 1

• the point where it reaches a standing body of water, which may be a lake or the sea.

Answer 1

River Mouth

Question 2

• a river mouth where there is a mixture of fresh water and seawater with accumulation of sediment within its confines, but without any build-out into the sea.

Answer 2

Estuary

Question 3

sites in the stratigraphic record for the formation and accumulation of fossil fuels.

Answer 3

Delta

Question 4

• a discrete shoreline protuberance formed at a point where a river enters the ocean or other body of water.
• forms where sediment brought down by the river builds out as a body into the lake or sea.

Answer 4

Delta

Question 5

formed by deposition of silt at the mouth of a stream or by overflow along the lower stream courses.

Answer 5

Delta Top
or
Delta Plain

Question 6

• the sloping portion of a delta, developed offshore from the bar at the mouth of a river.

Answer 6

Delta Front

Question 7

• the area furthest away from the delta front wherein sediments will deposit.

Answer 7

Prodelta

Question 8

• an elevated region of sediment typically found at a river delta which is located at the mouth of a river where the river flows out to the ocean.

Answer 8

Mouth bar

Question 9

• a stream that branches off and flows away from a main stream channel.

Answer 9

Distributary Channel

Question 10

• sheltered areas along the edge of the delta top where the channels build out elongate lobes of sediment.

Answer 10

Interdistributary Bays

Question 11

• a steep inclined area away from the delta top.

- the slope varies from only 1° or 2° in many fine-grained deltas to as much as 30° in some coarse-grained deltas.

Answer 11

Delta Slope

Question 12

• the site of deposition of bedload material.

Answer 12

Subaqueous Mouth Bar

Question 13

• the growth of a river delta farther out into the sea over time.

Answer 13

Progradation

Question 14

• the increase in land elevation, typically in a river system, due to the deposition of sediment.

Answer 14

Aggradation

Question 15

occurs in microtidal settings with limited wave energy, where delta-lobe progradation is significant and redistribution of mouth bars is limited.

Give an example

Answer 15

River-Dominated Delta

Mississippi Delta

Question 16

a type of delta characterized by mouth bars reworked into shore parallel sand bodies and beaches.

Give an example

Answer 16

Wave-Dominated Delta

• Rhone Delta
• Paraiba Delta

Question 17

• a type of delta which exhibit tidal mudflats and mouth bars that are reworked into elongate sand bodies perpendicular to the shoreline.

Give an example

Answer 17

Tide-Dominated Delta

• Ganges Delta
• Copper Delta

Question 18

• a particular delta formed by the combination of a supply of coarse sediment and a steep basin margin.

Answer 18

Gilbert Type Delta

Question 19

an essentially horizontal sedimentary layer deposited on top of a delta during floodstage.

Answer 19

Topset

Question 20

• an inclined bed deposited along the front of a delta.

Answer 20

Foreset

Question 21

• a layer of fine sediment deposited beyond the advancing edge of a delta and then buried by continuous delta growth.

Answer 21

Bottomset