Cromer Forest-bed Formation | |
---|---|
Stratigraphic range: Early Middle Pleistocene | |
Cromer Forest-bed Formation exposed at the base of the
West Runton Cliffs | |
Type | Geological formation |
Unit of | Dunwich Group |
Sub-units | Sheringham Member, Runton Member, West Runton Member, and Bacton Member |
Underlies | Middle Pleistocene glacial deposits |
Overlies | Wroxham Crag Formation or unconformity with Chalk Group |
Thickness | 6-to-8-metre (20 to 26 ft) |
Lithology | |
Primary | sands and silts |
Other | peat, mud, silty marl |
Location | |
Coordinates | 52°56′28″N 1°15′11″E / 52.941°N 1.253°E |
Region | ![]() |
Country | ![]() |
Type section | |
Named for | Cromer |
Named by | Clement Reid |
Location | The coast of North Norfolk from Weybourne to Happisburgh |
Year defined | 1882 |
Country | England |
The Cromer Forest-bed Formation, sometimes known as the Cromer Forest Bed, is a geological formation in Norfolk, England. It consists of river gravels, estuary and floodplain sediments predominantly silt, sand, and muds as well as peat along the coast of northern Norfolk. [1] It is the type locality for the Cromerian Stage of the Pleistocene between 0.8 and 0.5 million years ago. [2] The deposit itself range varies in age from about 0.8 to 0.5 million years ago. It is about 6-to-8-metre (20 to 26 ft) thick and is exposed in cliff section near the town of West Runton.
For over a century this formation, named after the local town of Cromer, has been famous for its assemblage of fossil mammal remains, containing the diverse remains of numerous taxa, including deer, [3] carnivorans [4] and birds. [5] Although most of the forest bed is now obscured by coastal defence, the Cromer Forest-bed Formation continues to be eroded and is rich in fossils including the skeletal remains of the West Runton Mammoth which was discovered in 1990. [6] [7] [8] [9]
The oldest human footprints outside Africa, the Happisburgh footprints as well as handaxes and bison bones with cut marks were also found in layers considered to belong to this deposit near the town of Happisburgh. [10]
Gibbard, P.L., S. Boreham, K.M. Cohen and A. Moscariello, 2007, Global correlation tables for the Quaternary, Subcommission on Quaternary Stratigraphy, Department of Geography, University of Cambridge, Cambridge, England.
Cromer Forest-bed Formation | |
---|---|
Stratigraphic range: Early Middle Pleistocene | |
Cromer Forest-bed Formation exposed at the base of the
West Runton Cliffs | |
Type | Geological formation |
Unit of | Dunwich Group |
Sub-units | Sheringham Member, Runton Member, West Runton Member, and Bacton Member |
Underlies | Middle Pleistocene glacial deposits |
Overlies | Wroxham Crag Formation or unconformity with Chalk Group |
Thickness | 6-to-8-metre (20 to 26 ft) |
Lithology | |
Primary | sands and silts |
Other | peat, mud, silty marl |
Location | |
Coordinates | 52°56′28″N 1°15′11″E / 52.941°N 1.253°E |
Region | ![]() |
Country | ![]() |
Type section | |
Named for | Cromer |
Named by | Clement Reid |
Location | The coast of North Norfolk from Weybourne to Happisburgh |
Year defined | 1882 |
Country | England |
The Cromer Forest-bed Formation, sometimes known as the Cromer Forest Bed, is a geological formation in Norfolk, England. It consists of river gravels, estuary and floodplain sediments predominantly silt, sand, and muds as well as peat along the coast of northern Norfolk. [1] It is the type locality for the Cromerian Stage of the Pleistocene between 0.8 and 0.5 million years ago. [2] The deposit itself range varies in age from about 0.8 to 0.5 million years ago. It is about 6-to-8-metre (20 to 26 ft) thick and is exposed in cliff section near the town of West Runton.
For over a century this formation, named after the local town of Cromer, has been famous for its assemblage of fossil mammal remains, containing the diverse remains of numerous taxa, including deer, [3] carnivorans [4] and birds. [5] Although most of the forest bed is now obscured by coastal defence, the Cromer Forest-bed Formation continues to be eroded and is rich in fossils including the skeletal remains of the West Runton Mammoth which was discovered in 1990. [6] [7] [8] [9]
The oldest human footprints outside Africa, the Happisburgh footprints as well as handaxes and bison bones with cut marks were also found in layers considered to belong to this deposit near the town of Happisburgh. [10]
Gibbard, P.L., S. Boreham, K.M. Cohen and A. Moscariello, 2007, Global correlation tables for the Quaternary, Subcommission on Quaternary Stratigraphy, Department of Geography, University of Cambridge, Cambridge, England.