Here you can find a list of source material I have used.
British Geological Survey, geological map of the UK. https://mapapps.bgs.ac.uk/geologyofbritain/home.html
The Geology of Britain: An Introduction. 2002 – Peter Toghill.
A New History of Life. 2016 – Peter Ward and Joe Kirschvink
The Great Extinctions, what caused them and how they shape life. 2013 – Normal Macleod.
The Hidden Landscape: A Journey into the Geological Past. 2010 – Richard Fortney
The Pebbles on the Beach: A Spotter’s Guide. 2018 – Clarence Ellis
The Universe Within. 2013 – Neil Shubin
How to read the Landscape. 2010 – Robert Yarham.