The River Holford is located in the east
Quantock Hills
The Quantock Hills west of Bridgwater in Somerset, England, consist of heathland, oak woodlands, ancient parklands and agricultural land. They were England's first Area of Outstanding Natural Beauty, designated in 1956.
Natural England have desi ...
Area of Outstanding Natural Beauty
An Area of Outstanding Natural Beauty (AONB; , AHNE) is an area of countryside in England, Wales, and Northern Ireland, that has been designated for conservation due to its significant landscape value. Areas are designated in recognition of ...
in
Somerset
( en, All The People of Somerset)
, locator_map =
, coordinates =
, region = South West England
, established_date = Ancient
, established_by =
, preceded_by =
, origin =
, lord_lieutenant_office =Lord Lieutenant of Somerset
, lord_ ...
England.
It is approximately long. Its source is at Lady's Fountain Spring, Frog Combe which is near
Halsway and above sea level before flowing past
Holford
Holford is a village and civil parish in West Somerset within the Quantock Hills Area of Outstanding Natural Beauty. It is located about west of Bridgwater and east of Williton, with a population of 392. The village is on the Quantock Greenway ...
towards its mouth at
Kilve.
The river is used as an outdoor classroom for students of Fluvial Geomorphology.
The geology of the river consists of three different rock types. At the top of the river there is the Devonian
Quartzite
Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone.Essentials of Geology, 3rd Edition, Stephen Marshak, p 182 Sandstone is converted into quartzite through heating and pressure usually related to tec ...
(
Metamorphic
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causi ...
), in the middle of the river there is the Permo-Triassic
Marl (
Sedimentary
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
) and the lower part of the river consists of Jurassic
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...
(
Sedimentary
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
). The first two rock types are impermeable meaning there is little drainage for the river but the river depth becomes smaller as the water flows over the permeable limestone which will allow water to pass through. Quartzite is also very resistant to chemical weathering and can form ridges.
References
External links
Holford River from Quontocks Online
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Holford, River