South-west England Chalk Group Lithostratigraphy: Jarvis & Woodroof (1984) & Jarvis & Tocher (1987) - Beer Head Limestone Formation: Difference between revisions

From MediaWiki
Jump to navigation Jump to search
(Created page with " The Beer Head Limestone Formation, named after Beer Head [SY 227 879], Devon, is a succession of hard, nodular, sandy limestones equating with the Cenomanian Limestone of pr...")
 
No edit summary
 
Line 1: Line 1:
The Beer Head Limestone Formation, named after Beer Head [SY 227 879], Devon, is a succession of hard, nodular, sandy limestones equating with the Cenomanian Limestone of previous authors. Jarvis & Woodroof (1984) subdivided it into four members, in ascending order, the Pounds Pool Sandy Limestone, the Hooken Nodular Limestone, the Little Beach Bioclastic Limestone and the Pinnacles Glauconitic Limestone, broadly corresponding to the divisions A1, A2, B and C recognised by Jukes-Browne & Hill (1903).  Owing to the variable development of the constituent members, the formation varies from c. +13 m to a metre or less in thickness, and conspicuous hardgrounds mark the base (top surface of Small Cove Hardground) and top (top surface of Haven Cliff Neocardioceras Hardground) of the formation (Jarvis & Woodroof, 1984).
The Beer Head Limestone Formation, named after Beer Head [SY 227 879], Devon, is a succession of hard, nodular, sandy limestones equating with the Cenomanian Limestone of previous authors. Jarvis & Woodroof (1984) subdivided it into four members, in ascending order, the Pounds Pool Sandy Limestone, the Hooken Nodular Limestone, the Little Beach Bioclastic Limestone and the Pinnacles Glauconitic Limestone, broadly corresponding to the divisions A1, A2, B and C recognised by Jukes-Browne & Hill (1903).  Owing to the variable development of the constituent members, the formation varies from c. +13 m to a metre or less in thickness, and conspicuous hardgrounds mark the base (top surface of Small Cove Hardground) and top (top surface of Haven Cliff Neocardioceras Hardground) of the formation (Jarvis & Woodroof, 1984).



Latest revision as of 14:03, 7 October 2013

The Beer Head Limestone Formation, named after Beer Head [SY 227 879], Devon, is a succession of hard, nodular, sandy limestones equating with the Cenomanian Limestone of previous authors. Jarvis & Woodroof (1984) subdivided it into four members, in ascending order, the Pounds Pool Sandy Limestone, the Hooken Nodular Limestone, the Little Beach Bioclastic Limestone and the Pinnacles Glauconitic Limestone, broadly corresponding to the divisions A1, A2, B and C recognised by Jukes-Browne & Hill (1903). Owing to the variable development of the constituent members, the formation varies from c. +13 m to a metre or less in thickness, and conspicuous hardgrounds mark the base (top surface of Small Cove Hardground) and top (top surface of Haven Cliff Neocardioceras Hardground) of the formation (Jarvis & Woodroof, 1984).

Macrofossil Biozonation: see under details of each Member

Correlation: see Correlation with other lithostratigraphical schemes for south-west England

see Correlation with other UK regions

References

JARVIS, I & WOODROOF, P B. 1984. Stratigraphy of the Cenomanian and basal Turonian (Upper Cretaceous) between Branscombe and Seaton, S E Devon, England. Proceedings of the Geologists' Association, Vol. 95 (3), 193-215.

JUKES-BROWNE, A J & HILL, W.1903. The Cretaceous rocks of Britain. Vol. 2 - The Lower and Middle Chalk of England. Memoir of the Geological Survey of the United Kingdom.

See: Cenomanian Limestone, Pounds Pool Sandy Limestone, Hooken Nodular Limestone, Little Beach Bioclastic Limestone, Pinnacles Glauconitic Limestone, A1, A2, B, C, hardground,