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FACTORS AFFECTING COASTAL RECESSION : Bedrock lithology (IGNEOUS (basalt,…
FACTORS AFFECTING COASTAL RECESSION : Bedrock lithology
IGNEOUS (basalt, granite)
Crystaline
Resistant
Born form fire
impermeable
Average recession rate : 1mm / year
Few joins
UNCONSOLDATED (boulder clay)
Average recession rate boulder clay - 1m / year
Not cemented together
Easily eroded
SEDIMENTARY (chalk, limestone, Sandstone)
Porous
Permeable (jointed)
Formed in tropical marine environments
Impermeable
Average recession for limestone = 2.5cm / year
Erodes fast
METAMORPHIC (marble)
Resistant
Impermeable
Very hard
Formed from intense heat and presure
Crystalline metamorphic rocks
Often solid and heavenly fractured