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Longmyndian Supergroup

Ediacaran EuropeGeologic supergroups of the United KingdomGeology of ShropshireGeology of Wales

The Longmyndian Supergroup is a 6,000-metre-thick (20,000 ft) sequence of Ediacaran (late Precambrian) rocks that outcrop between the Pontesford–Linley Fault System and the Church Stretton Fault System in the Welsh Borderland Fault System of England and Wales. The supergroup consists of two major geological groups, the Stretton Group and the overlying Wentnor Group. The successions represented by these two groups have also been referred to as the Eastern Longymndian and Western Longmyndian respectively, forming as they do the bedrock of the east and west parts of the Long Mynd in Shropshire. The rocks are a generally regressive sequence from basinal facies to clastic sedimentation. The rocks are thought to be derived from Uriconian mountains that were formed during the southward subduction of an oceanic plate beneath a continental block (ocean closure). The rocks have since been folded due to fault movements and plunge gently to the south. The Longmyndian rocks were deposited in northeast–southwest trending faulted rift basins. These were deposited on top of the Uriconian volcaniclastic deposits. Subsequent ocean closure squeezed these rocks together to provide sub-vertical bedding in the synclinal sequence seen in exposed rocks today. The deposited rocks of the Longmyndian show a variety of depositional facies that tell a story of ocean closure. The Longmyndian deposits rest upon Uriconian rocks but different sections are exposed exclusively between the Church Stretton Fault and the Pontesford-Linley Lineament.

Excerpt from the Wikipedia article Longmyndian Supergroup (License: CC BY-SA 3.0, Authors).

Longmyndian Supergroup
Lightspout Hollow,

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N 52.54775 ° E -2.838894 °
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Lightspout Hollow

Lightspout Hollow

England, United Kingdom
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Little Stretton, Shropshire
Little Stretton, Shropshire

Little Stretton is a village and former civil parish, now in the parish of Church Stretton, in the Shropshire district, in the ceremonial county of Shropshire, England. In 1961 the parish had a population of 80. Little Stretton became a civil parish in 1899 being formed from Church Stretton, on 1 April 1966 the parish was abolished and merged with Church Stretton. It is located in the Shropshire Hills Area of Outstanding Natural Beauty between the Long Mynd and Ragleth Hill. Lying on the B5477 south of the market town of Church Stretton; similarly, the small village of All Stretton lies to the north of Church Stretton on the same road. A milestone in the centre of the village on the B5477, which is called Ludlow Road at this point, indicates that Ludlow is 14 miles (23 km) away, to the south. The centre of Church Stretton is 1.3 miles (2.1 km) away via the B5477. The Quinny Brook runs from Ashes Hollow through the village and it is a popular place to begin walks up the Long Mynd. The village lies between 590 and 616 feet above sea level. Ragleth Hill lies immediately to the east of the village, on the other side of the Welsh Marches Line and A49. Little Stretton once had its own railway halt: Little Stretton Halt railway station. To the southwest are the hamlets of Minton and Hamperley, which are part of Church Stretton parish and are included within the parish ward of Little Stretton. The modern-day parish of Church Stretton is sometimes referred to as "Church Stretton and Little Stretton".