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Geology of Hertfordshire
The rocks of the English county of Hertfordshire belong to the great shallow syncline known as the London basin, the beds dip in a south-easterly direction towards the syncline's lowest point roughly under the River Thames. The most important formations are the Cretaceous chalks, which are exposed as the high ground in the north and west of the county, and the Tertiary rocks made up of the Paleocene age Reading Beds and Eocene age London Clay that occupies the remaining southern part.
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