Slope and basin environments

Question 1

What depositional processes occur on ramps and other gentle slopes?

Answer 1

Below FWWB: current-/storm-dominated sedimentation
Below SWB: fine-grained limestones, siliciclastic shales

Question 2

What depositional processes occur on slopes and basins adjacent to shelves?

Answer 2

Remobilisation by debris/gravity flows, calciturbidites, and rock fall/slumps

Question 3

Give two other depositional processes on slopes and basins

Answer 3

Deposition from bottom currents
In situ pelagic fall out

Question 4

Describe turbidites

Answer 4

Slope deposits
Varying degrees of completeness of Bouma sequence

Question 5

Describe grain flow deposits

Answer 5

Slope deposits
Well-sorted carbonate sands with reverse grading

Question 6

Describe debrites

Answer 6

Slope deposits
Little sorting/grading
Rudstones and floatstones

Question 7

What organisms are found in basin deposits?

Answer 7

Foraminifera, coccolithophorids, diatoms, radiolaria

Question 8

What is deposition distribution in basins controlled by?

Answer 8

Productivity and ocean currents