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Downrow Quarry, Bishop's Tawton, North Devon, Devon, England, UK

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Collecting phosphate minerals at Downrow Quarry

Downrow Quarry, Bishop's Tawton, North Devon, Devon, England, UK
Cacoxenite etc. plate as removed from the quarry wall.

Downrow Quarry, Bishop's Tawton, North Devon, Devon, England, UK
Latitude & Longitude (WGS84): 51° 2' 47'' North , 4° 1' 23'' West
Latitude & Longitude (decimal): 51.04663,-4.02311
GeoHash:G#: gcj4kky2n
Other regions containing this locality:Devon and Cornwall metalliferous mining district, England, UK
Locality type:Quarry
Köppen climate type:Cfb : Temperate oceanic climate

This small, private quarry, occasionally worked for aggregates lies in the uppermost unit of the Codden Hill Cherts. The rock here varies between friable and moderately competent, and is intensely fractured.

The largely carbonate depleted mud and siltstones contain occasional fossils and frequent, lenticular phosphatic nodules (presumably coprolites comprising mainly fish bones and chitin) many of which have undergone variable dissolution.

The rock is variously stained with red, yellow and brown iron oxides/hydroxides; dendritic manganese minerals are frequent. In parts, the quarry exhibits very local and intense phosphate mineralisation.

Mineral List

8 valid minerals.

Rock Types Recorded

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Mineralization age: Mississippian : 341 Ma to 326.4 ± 1.6 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
ⓘ Mudstone (youngest age)326.4 ± 1.6 Ma
ⓘ Siltstone (youngest age)326.4 ± 1.6 Ma
ⓘ Greywacke (youngest age)326.4 ± 1.6 Ma
ⓘ Mudstone (oldest age)341 Ma
ⓘ Siltstone (oldest age)341 Ma
ⓘ Greywacke (oldest age)341 Ma

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Late Carboniferous
298.9 - 323.2 Ma

ID: 3157938
Clackmannan Group

Age: Pennsylvanian (298.9 - 323.2 Ma)

Stratigraphic Name: Clackmannan Group

Lithology: Major:{sandstone}, Minor{siltstone,mudstone}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Namurian - Famennian
315 - 372.2 Ma

ID: 2035892
Teign Valley Group

Age: Paleozoic (315 - 372.2 Ma)

Stratigraphic Name: Teign Valley Group

Lithology: Mudstone, siltstone and sandstone

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Early Carboniferous
323.2 - 358.9 Ma

ID: 3192903
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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