The rocks around the Stoke Park Estate are very varied in age and character. The youngest belong to the Jurassic Period (149-200 million years ago) and are represented by limestone and clay layers containing the remains of animals that would have once lived in a tropical sea.
Below these are older rocks of Triassic age (between 190 and 250 million years old). These occur as relatively soft, friable rocks which are part of the Mercia Mudstone Group formed in lagoons when the climate was hot and dry.
The oldest rocks – Triassic sandstones (near Duchess Pond) were formed under desert conditions when most of the world’s continents were together as one super-continent called Pangaea.
A number of fossil remains from Stoke Park can be seen at Glenside Museum.