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The Ercall

EngvarB from October 2013Geology of ShropshireHills of ShropshireSites of Special Scientific Interest in ShropshireTelford and Wrekin
ErcallHill
ErcallHill

The Ercall is a small hill in Shropshire, England, between The Wrekin and Wellington. It is an internationally important geological site, part of The Wrekin and The Ercall Site of Special Scientific Interest (SSSI). The hill is managed by Shropshire Wildlife Trust and includes 540 million year old ripple beds and ancient pre-Cambrian lava flows in exposed quarries. Quartzite from the neighbouring Wrekin is also visible. The Ercall bears the marks of extensive quarrying, although the quarries are now disused, safe and open to the public. When the M54 motorway was constructed in 1974, the road was built through the northern end of the hill.

Excerpt from the Wikipedia article The Ercall (License: CC BY-SA 3.0, Authors, Images).

The Ercall
Ercall Lane,

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Latitude Longitude
N 52.68291 ° E -2.52952 °
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Ercall Lane
TF6 5AL
England, United Kingdom
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ErcallHill
ErcallHill
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Uriconian

Uriconian rocks are volcanic rocks found in parts of Shropshire, United Kingdom. The name relates to Uriconio, the Latin name for an Iron Age hillfort on the summit of the Wrekin, a hill formed of Uriconian rock. The Uriconian rocks of Shropshire (Wrekin Terrane) are thought to be potentially related to the Longmyndian Supergroup of the Stretton Hills, Shropshire, United Kingdom. Current geological profiling of the terranes suggests that the Uriconian rocks are of Precambrian age (Neoproterozoic Phases 2 and 3). The Uriconian Rocks outcrop to the southeast of the Long Mynd area of the Welsh Borderland Fault System and beyond the Church Stretton Fault which trends northeast-southwest across the area. The Stretton Hills are composed primarily of arenaceous (quartz rich sand) beds assigned to the Longmyndian Supergroup. The Longmyndian rocks are a c.6 km thick group of volcaniclastic and bentonitic sediment horizons. The Uriconian have long thought to be older than the Longmyndian and generally outcrop to the southeast of the latter within northeast-southwest trending lineaments suggesting basement influence for the regional structure.The Uriconian rocks outcrop in areas from Wellington, Shropshire to Primrose Hill on the southwest side of The Wrekin, east of Caer Caradoc and in the Craven Arms Inlier. Primarily the strata exist as fault-bounded slices within splays of, and to the southeast of, the main Church Stretton fault system. The Uriconian rocks comprise both intermediate to acidic and basic (bimodal) volcanic suites that reflect largely intraplate origins for the complex although some subduction signatures have been identified. Further work has led to suggest that the locality of this kind of volcanism is related to marginal basin volcanicity (behind the main arc) influenced by trans-tension brought about by oblique subduction.The Neoproterozoic sediments were deposited on Avalonia in various strike-slip faulted basins and they comprise predominantly volcaniclastic and siliciclastic sediments.