Hertfordshire puddingstone
Hertfordshire puddingstone is a conglomerate sedimentary rock composed of rounded flint pebbles cemented together by a younger matrix of silica quartz. The distinctive rock is largely confined to the English counties of Buckinghamshire and Hertfordshire but small amounts occur throughout the London Basin. It is quite commonly found in fields in and around Chesham, where pieces can be seen as boundary stones and in rockeries. Despite a superficial similarity to concrete, it is an entirely natural silcrete. A fracture runs across both the pebbles and the sandy matrix as both have equal strength unlike concrete where the pebbles remain whole and a fracture occurs only in the matrix. Like other puddingstones, it derives its name from the manner in which the embedded flints resemble the plums in a pudding. It forms the local base of the Upnor Formation of the Lambeth Group.
A fragment from a quern of probable Roman date made from Hertfordshire puddingstone. The rock contains many oval shaped grey and white pebbles of varying sizes in a quartz (silica) matrix.
A polished section of Hertfordshire puddingstone
Samples of Hertfordshire puddingstone at Hertford Museum
Hertfordshire puddingstone outside the Cock and Rabbit public house at The Lee, near Chesham
Chesham is a market town and civil parish in Buckinghamshire, England, United Kingdom, 11 miles (18 km) south-east of the county town of Aylesbury, about 26 miles (42 km) north-west of central London, and part of the London commuter belt. It is in the Chess Valley, surrounded by farmland. The earliest records of Chesham as a settlement are from the second half of the 10th century, although there is archaeological evidence of people in this area from around 8000 BC. Henry III granted a royal charter for a weekly market in 1257.
The Chesham clock tower, located in the Market Square
St Mary's Church
Church Street, Chesham
Thomas Harding memorial