Abstract
The lithostratigraphy of the Maastrichtian, Danian and Selandian deposits of Copenhagen is described and related to a biostratigraphical zonation based on foraminifera. The Quaternary deposits are briefly mentioned. The København Limestone Formation is formally introduced. The Lellinge Greensand Formation is emended and a reference section in Copenhagen is defined. The structures of the area are discussed on the basis of detailed subsurface mapping. The geology of the area is finally described in detail.
Highlights
Geology of the Copenhagen area predominantly based on investigations for an urban underground railway
The results of the investigations were published in a series of reports which dealt with the technical problems
Many geological observations were omitted from these reports s ince the y had no bea ring on th e technica l arg ument s
Summary
Den øverste del af kridtlagene blev udviklet som hardgrounds, men detaljerne i udformningen af maastrichtien-danien grænsen viser, at der har hersket noget varierende lokale forhold . Den øverste del af København Kalken er i a ll e boringer meget ensartet udviklet og svagt men regelmæssigt lagdelt, hvad der sammenholdt med den ensartede udvikling afforaminiferfaunaerne tyder på, at der har været rolige og ensartede sedimentationsforhold i hele området. Den øverste del af København Kalken indeholder som omtalt stærkt maastrichtien prægede planktoniske foraminiferfaunaer Lellinge Grønsandet afspejler en fortsat transgression af området, under hvilken der aflejredes stadig mere finkornede lag med aftagende kalkindhold og tiltagende lerindhold, som beskrevet af blandt andre Gry (1935). 16), at Valby-Stevns Horsten ved selandientidens begyndelse har været et landområde, som adskilte Gilleleje-København-Klagshamn området (med fjordkarakter) fra det vestlige område, Lellinge-Midtsjælland området (med mere åbne marine forhold). Bor lokaliseret 1f lg or,g,nole op!ysn o Bor lokal iseret d ig OGU 's boreork-~ rt
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