Radstock - Geography

Geography

The main geological feature in this area of the Mendip Hills south of Hallatrow consists of Supra-Pennant Measures which includes the upper coal measures and outcrops of sandstone. The southern part of the Radstock Syncline have coals of the Lower and Middle Coal Measures been worked, mainly at the Newbury and Vobster collieries in the southeast and in the New Rock and Moorewood pits to the southwest. The Hercynian orogeny caused shock waves in the rock as the Mendip Hills were pushed up, forcing the coal measures to break along fractures or faults. Along the Radstock Slide Fault the distance between the broken ends of a coal seam can be as much as 1,500 feet (457 m).

Radstock lies on the River Somer which runs through the Kilmersdon Valley to join the Cam Brook at Midford to form Midford Brook before joining the River Avon close to the Dundas Aqueduct and the remains of the Somerset Coal Canal. The base of the Kilmersdon Valley is of alluvium deposits. Above this on both sides of all of the valley is a band of shales and clays from the Penarth Group. These rocks are from the Triassic period. The majority of the remaining upland around Radstock is Lias Limestone (white and blue) while the very highest part above 130 m, south of Haydon, is a small outcrop of Inferior Oolitic Limestone. All these limestones are from the Jurassic period. The steepest slopes of both the Kilmersdon and Snail’s Bottom valleys have frequently slipped. Below all of the area is the coal bearing Carboniferous strata. Haydon is an outlier of Radstock and was built to house the miners for the local pit. The disused railway line and inclined railway at Haydon form important elements within the Kilmersdon valley east of Haydon. The modern landscape has a less maintained and "rougher" character and texture than neighbouring agricultural areas. This is caused in the main by the remnants of the coal industry and its infrastructure and changes in agricultural management. The disturbance caused by coal mining and the railways and the subsequent ending of mining and disuse of the railways has created valuable habitats of nature conservation interest.

Along with the rest of South West England, Radstock has a temperate climate, which is generally wetter and milder than the rest of England. The annual mean temperature is about 10 °C (50 °F) with seasonal and diurnal variations, but because of the modifying effect of the sea, the range is less than in most other parts of the United Kingdom. January is the coldest month, with mean minimum temperatures between 1 °C (34 °F) and 2 °C (36 °F). July and August are the warmest months in the region, with mean daily maxima around 21 °C (70 °F). In general, December is the dullest month and June the sunniest. The southwest of England enjoys a favoured location, particularly in summer, when the Azores High extends its influence north-eastwards towards the UK.

Cloud often forms inland, especially near hills, and reduces exposure to sunshine. The average annual sunshine is about 1,600 hours. Rainfall tends to be associated with Atlantic depressions or with convection. In summer, convection caused by solar surface heating sometimes forms shower clouds, and a large proportion of the annual precipitation falls from showers and thunderstorms at that time of year. Average rainfall is 800–900 mm (31–35 in). About 8–15 days of snowfall is typical. November to March have the highest mean wind speeds, and June to August having the lightest. The predominant wind direction is from the southwest.