Editing Oxted (section)

===Geology===
The oldest outcrops in the area are of [[Weald Clay]], which comes to the surface in the south of the civil parish. A [[borehole]], dug in 1958, indicated that the clay beneath Hurst Green and Holland is {{cvt|557|ft|m}} deep.{{sfn|Dines|Buchan|Holmes|Bristow|1969|pp=28, 32}} Gravels deposited by earlier courses of the River Eden and its tributaries, are found above the clay in the same area.{{sfn|Dines|Buchan|Holmes|Bristow|1969|pp=124, 134}} A thin band of Atherfield Clay comes to the surface between Hurst Green and Oxted,{{sfn|Dines|Edmunds|Chatwin|Stubblefield|1933|p=44}} north of which are the Sandgate Beds, which overlie the Hythe Beds.<ref name=Dines_1933_pp58-59>{{harvnb|Dines|Edmunds|Chatwin|Stubblefield|1933|pp=58–59}}</ref>{{refn|In the Oxted area, the Sandgate Beds take the form of [[greensand|glauconitic sand]] and grey sandy [[limestone]], but to the west of [[Reigate]] they are observed as [[loam]]y clays containing bands of [[calcium carbonate|calcerous]] sandstone.<ref name=Dines_1933_pp58-59/> |group=note}} The town centre is primarily on the [[Folkestone Beds]], which take the form of a [[iron|ferruginous]] [[quartz]]-rich sandstone, containing seams of [[ironstone]]{{sfn|Dines|Edmunds|Chatwin|Stubblefield|1933|pp=73-74, 174}} and [[mica]].{{sfn|Dines|Edmunds|Chatwin|Stubblefield|1933|p=78}} To the west of Oxted railway station, there is a thin wash of pebbles, thought to have been deposited by river action during the [[Pleistocene]].{{sfn|Dines|Edmunds|Chatwin|Stubblefield|1933|p=174}}  To the north of the town, the [[Chalk Group|Chalk]] of the North Downs has historically been divided into three bands: Lower Chalk, Middle Chalk and Upper Chalk. At Oxted, the middle chalk is around {{cvt|200|ft|m}} thick.{{sfn|Dines|Edmunds|Chatwin|Stubblefield|1933|p=97}}