Geog rock types and Tides - Coastal Systems

basalt/granite

massively jointed, very strong, high cliffs

limestone and chalk

sedimentary ,densely jointed, wave erosion susceptible, stacks and arches

sandstone

fin grained sedimentary rocks, high density joints so easily eroded and collapse easily.

sands, clays, glacial till

unconsolidated, easily eroded, weak rocks, collapse easily, slumping and mass movement

concordant

large scale rock structures parrallel to coastline

concordant create

flatter coastlines

discordant

large scale rock structures perpendicular to coastline

discordant forms

headlands and bays, irregular shaped coastline

neap tide

moon and sun at right angle, weakest gravitational pull

spring tie

moon and sun are aligned, grav pull is at its strongest

Famous discordant coastline

Dorset - Durdle head

famous concordant coastline

Lulworth cove - Dorset coast