Magnesian Conglomerate

Magnesian Conglomerate
Stratigraphic range: Rhaetian ~208–202 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Slickstones Quarry, where an outcrop of the Magnesian Conglomerate is present
Type	Geological formation, fissure fill
Underlies	none
Overlies	Friars Point Limestone Formation?
Lithology
Primary	Breccia
Other	Limestone
Location
Coordinates	51°30′N 2°36′W / 51.5°N 2.6°W / 51.5; -2.6
Approximate paleocoordinates	35°54′N 0°48′E / 35.9°N 0.8°E / 35.9; 0.8
Region	South West England & South Wales
Country	England
Extent	Bristol
Type section
Named by	Henry Riley & Samuel Stutchbury
Year defined	1836
Magnesian Conglomerate (England)

The Magnesian Conglomerate is a geological formation in Clifton, Bristol in England (originally Avon), Gloucestershire and southern Wales, present in Tytherington, Durdham Down, Slickstones Quarry and Cromhall Quarry.

It dates back to the Rhaetian stage of the Late Triassic,^[1][2] although it may be as old as the Norian stage of the Late Triassic and as young as the Hettangian stage of the Early Jurassic.^{[citation needed]}

The Magnesian Conglomerate was first discovered in autumn 1834 and was studied in 1836 by Henry Riley and Samuel Stutchbury.^[3]

The Avon Fissure Fill is often paired with the Magnesian Conglomerate.^[1]