parasequence - clastic shoreline sedimentary facies

aggradation

aggradational parasequence set

bedsets

boundaries

boundaries bounding surfaces

diachronous

marine flooding surface

maximum flooding surface (mfs)

parasequence

parasequence - clastic beach

parasequence - delta

parasequence - stacked beaches

parasequence - tidal flat

parasequence set

progradation

progradational parasequence set

shoreline

sequence

regression

regressive surface of erosion

regressive systems tract

retrogradation

retrogradational parasequence set

sequence

stacking patterns

systems tract

transgressive surface

transgressive systems tract

Walthers Law


Figure 5 above is associated with the exercises on high frequency clastic
parasequences.

Note the hierarchy of sedimentary structures and their association, from seaward to landward, with the different depositional systems that are listed in Table below. The vertical and lateral relationships seen here are intended to demonstrate the basis of Walther's Law.

setting
effect of waves and tide
tidal zone, subject to storm wash-over
trough-cross bedded fill of tidal inlets, estuary and fluvial channels
rooted seat earths and coals
foreshore and upper shoreface
zone of breaking waves and swash zone
trough-cross stratified sandstone sometimes overlain by planar-cross bedded sandstone
lower shoreface and delta-front sandstones
just above fair-weather wave base
current ripple beds
wave ripple beds,
hummocky cross-beds
contorted beds
transition between offshore shelf and lower shore-face
between storm wave-base & fair-weather wave-base
alternations of hummocky cross-stratified sandstone
highly burrowed silty mudstones
offshore shelf
below storm wave-base
highly burrowed mudstone

Table of the relationship between sediments of a clastic shoreline depositional setting to tide & waves, and sedimentary structures.


Thursday, November 11, 2021
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