sedimentary archives terrestrial or continental environments

SEDIMENTARY ARCHIVES

Terrestrial or Continental Environments


Terrestrial or Continental EnvironmentsFluvial


Continental Environments

Fluvial

Point Bar

Silt, Sand, Clay

Few fossils



Sediments highly variable, depends on energy of river



Alluvial fans



Lakes or Lacustrine



Glacial



Glacial

TillOutwash



Eolian



Eolian

Wind can move sedimentSand size or smallerVery well sorted

SEDIMENTARY ARCHIVESSedimentary Structures

Formed during or shortly after depositionPrior to lithification Can be used to interpret environments

"The question is not what you look at, but what you see" Henry David Thoreau November 1830


Mudcracks


Ripples

Indicate directionUni-directional = asymmetrical or currentBi-directional = symmetrical or oscillationMulti-directional = interference

Found in shallow marine water and streams


Ripples

Oscillation Ripples Up direction?


Ripples

Current Ripples


Ripples

Interference Ripples


Cross-bedding or Cross-stratification



Beds in which one set is inclined to othersAdvance of delta or dunesCurrent dominated environmentWind or waterSlope of cross-bed can indicates current or prevailing wind direction



Tabularor

Planar



Trough


Graded beds

sedimentary archives terrestrial or continental environments

Documents

lacustrine slide

sorted slide

planar slide

outwash slide

crossstratification

continental environments

energy of river slide

crossstratification