The Avon Group is a

stratigraphic unit A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it ...

of Courceyan age (

Lower Carboniferous Lower may refer to: *Lower (surname) *Lower Township, New Jersey *Lower Receiver (firearms) *Lower Wick Lower Wick is a small hamlet located in the county of Gloucestershire, England. It is situated about five miles south west of Dursley, eight ...

) found in southern

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

and the west of England. It forms part of the Carboniferous Limestone Supergroup. The term replaces the old 'Lower limestone Shale Group' of this region. It is typically shown undivided on geological maps though three formations are identified on mapping of parts of South wales, namely the Tongwynlais, Castell Coch Limestone and Cwmyniscoy Mudstone formations as defined by Waters and Lawrence (1987). The Shirehampton Formation was recognised in the Bristol area by Barton et al (2002). The entire Avon succession is referred to as the Jackie Parr Limestone Formation (Bridge & Hough (2002)) where it outcrops at

Clee Hill Titterstone Clee Hill, sometimes referred to as Titterstone Clee or Clee Hill, is a prominent hill in the rural England, English county of Shropshire, rising at the summit to above sea level. It is one of the Clee Hills, in the Shropshire Hill ...

and

Little Wenlock Little Wenlock is a village and civil parish in Shropshire, England. The population of the civil parish at the 2011 census was 605. It was mentioned in the Domesday Book, when it belonged to Wenlock Priory. Ancient habitation is attested by the ...

in Shropshire.

References

{{Reflist Geology of Somerset Limestone formations of the United Kingdom Carboniferous Wales Carboniferous System of Europe

See also

References