Cross stratification angles vary from 0 to 20 fig.
Planar lamination in stratigraphic column.
Look for sedimentary structures that are characteristic of a specific environment or process.
Here is an outline of how to approach interpreting the depositional environment represented by a stratigraphic column.
Interpreting stratigraphic columns step 1.
The original depositional layering is tilted such tilting not being the result of post depositional deformation cross beds or sets are the groups of inclined.
As the river migrates towards the direction of the eroding bank the current ripples of the point bar will end up being deposited on top of planar lamination dune cross stratification of the bank.
The point bar of the river will produce current ripple lamination due to the finer sediment and slower flow speeds.
Through transect of exposed strata along the coppermine river.
The sedimentary structures which result are roughly horizontal units composed of inclined layers.
The coarser grained areas that result from a faster flow speed will have upper planar lamination or dune cross stratification.
Turbidites vs river channel deposits.
Most sandstone beds are medium grained and display planar lamination with well developed parting lineations large scale hummocky cross stratification like structures hcs.
Evaluate how the vertical sequence of sedimentary structures changes to refine or.
4 a shows a large scale planar lamination partially cut by the drill core.
Evaluate how the vertical sequence of sedimentary structures changes to refine or correct your environmental interpretations.
When developed some slightly curved or planar lamination foresets may be observed with no evidence of clear grain size sorting.
In geology cross bedding also known as cross stratification is layering within a stratum and at an angle to the main bedding plane.
Primary structures include planar lamination and sporadic small scale cross lamination.
Bed thickness is highly variable.
Planar lamination step 4.
Which displays a faint planar lamination disrupted by polygonal fractures.
These laminations can be related to solitary or stacked trough crossbeds st or planar crossbeds sp fig.
The hcs like structures are composed of stacked lamina sets that thin and thicken within each bedset with successive lamina sets separated by muddy partings.
The planar laminated to low angle cross stratified facies typically shows fine lamination that is geometrically arranged in bed sets having horizontal to low angle cross stratification.
6c and symmetrical to slightly asymmetrical ripple bedforms and cross lamination.
Distal facies display repetitive successive units that rarely exceed two meters in thickness whereas proximal facies often include units of 20 m or more.
Look for sedimentary structures that are characteristic of a specific environment or process examples.
