Dalby Group

The Dalby Group is a Silurian lithostratigraphic group (a sequence of rock strata) on the west coast of the Isle of Man in the Irish Sea. The name is derived from the village of Dalby near the west coast of the island. Together with those of the adjoining Manx Group, the rocks of the Group have also previously been referred to as the Manx Slates or Manx Slate Series. The group comprises wacke sandstones with siltstones and mudstones which reach a thickness of about 1200m in the west of the island. It contains only the single Niarbyl Formation which is exposed along the coast between Niarbyl Point and the town of Peel to the north.[1][2][3]

Dalby Group Stratigraphic range: Wenlock epoch of Silurian
Type	Group
Sub-units	Niarbyl Formation
Overlies	Manx Group (probably unconformably)
Thickness	c.1200m
Lithology
Primary	sandstone
Other	siltstone, mudstone
Location
Region	Isle of Man
Country	United Kingdom (Crown dependency)
Extent	Niarbyl to Peel
Type section
Named for	Dalby

References

1. "Dalby Group". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved January 20, 2019.
2. "Niarbyl Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved January 20, 2019.
3. Isle of Man solid and drift geology, 1:50,000 scale. British Geological Survey, NERC. 2001. ISBN 0751833266.

• The Geological Society (2006). Brenchley, P.J. (ed.). The Geology of England (2. ed.). London: Geological Society Publishing. pp. 103–107. ISBN 9781862392007.