coastal systems -Dorset coast Flashcards
(22 cards)
is the Dorset coast a high or low energy coastline?
.high energy -due to a really long fetch which means powerful destructive waves are created as they travel a great distance before breaking
what is the geology of the purbeck coast in dorset?
.north to south -discordant geology (alternating bands of soft and hard rock perpendicular to the coastline)
.east to west -concordant geology (constant hard rock)
what are the erosional landforms seen at the Dorset coast?
.headlands
.bays and beaches
.stacks
.cove
.arch
what is the headland on the Dorset coast called?
.the foreland and old harry
what is the geology of old harry?
.resistant chalk with horizontal bedding planes and vertical cracks
.discordant coastline
.no dip
what are the erosional processes happening at old harry?
.hydraulic action
.abrasion
.solution
what are the sub-aerial processes happening at old harry?
.mechanical weathering -freeze thaw
.chemical weathering -carbonation
.mass movement -rock falls
what is the bay and beach at Dorset coast called?
.swanage bay
what is the geology like at swanage bay?
.less resistant sands and clay
.discordant coastlines (between headlands of chalk and limestone)
.no dip
what are the marine processes happening at swanage bay?
.deposition due to wave refraction in the bay
what are the stacks called at Dorset coast?
.mupe rocks
what is the geology like at mupe rocks?
.resistant limestone, bedding planes
.concord at coastline (shale behind limestone)
.steep landward dip (more stable)
what are the erosional process happening at mupe rocks?
.hydraulic action
.abrasion
.solution
what are the sub-aerial process happing at mupe rocks?
.all weathering processes
.mass movement -rockfall
what is the cove called at the Dorset coast?
.lulworth cove
what is the geology of lulworth cove?
.less resistant shales and marls, resistant limestone and chalk
.concordant coastline (chalk behind shale behind limestone)
.landward dip (more stable)
what erosional processes happily at lulworth cove?
.hydraulic action
.abrasion
.solution
what sub-aerial processes are happening at lulworth cove?
.weathering and mass movement processes
what is the arch called at the Dorset coast?
.durdle door
what is the geology of durdle door?
.resistant Portland and Purbeck Limestones, faulted and folded
.concordant coastline
.slight landward dip
what are erosional processes happing at durdle door?
.hydraulic action
.abrasion
.solution
what sub-aerial processes happening at durdle door?
.weathering and mass movement processes
