Lacustrine Environments
• Highly variable and not well studied
• Importance
• Economic
– Source rocks and oil shales
• Climate Change
• Paleontology
Lacustrine Environments
• Forming factors:
– Tectonics, glacial activity, volcanism
• Sedimentation Factors
– Tectonics & climate
Lacustrine Environments
• Sedimentation in lakes
• Open versus closed
• Climate = stratification
• Climate = sediment type - water chemistry
Lacustrine Environments
• Waves and tides
• High sedimentation rate
• Sediment types
• Algae, pelecypods, ostracodes
• Open = siliciclastics
• Closed = carbonates and evap.
• Varves
• Lake Baikal
Lacustrine Facies
• Recognition
• Fossils, varves, facies associations (fluvial, soils)
• Fining or coarsening upward - basinward fining, and basin fill
Lacustrine Facies
• Green River Formation
• Vertical succession of facies
Lacustrine Facies
• Green River Formation
• Cycles of repeating facies
• Tectonics and Climate
• Sequence stratigraphy