This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Quarterly journal of the Geological Society of London . PEOCEEDINGS OF THE GEOLOGICAL SOCIETY Jnne to the Acton gravels is seen in the cross section of the valley which passes through both places fig The outcrop of the London Clay is here seen intervening between the two localities separating the high from the mid terrace