Upnor Formation

The Upnor Formation is a geological formation found in the London Basin of southeastern England.^[1] It is of Thanetian (Upper Paleocene) age. It lies unconformably on the Thanet Formation for most of its outcrop, but in the west it lies directly on Chalk Group.^[2] It is generally overlain either by the Reading Formation or the Woolwich Formation, but locally in north and east Kent it is overlain unconformably by the Harwich Formation. It forms the lowermost part of the Lambeth Group. The type section is at Lower Upnor Pit, north Kent. The formation has provided fossils of the eutherian mammal Arctocyonides arenae.^[3]

Upnor Formation
Stratigraphic range: Thanetian ~58.7–55.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Exposure in Gilbert's Pit. Dark grey clays, and light grey shelly clays of the Woolwich Formation overlying yellow-brown weathering sands of the Upnor Formation
Type	Formation
Unit of	Lambeth Group
Sub-units	Beltinge Fish Bed
Underlies	Reading Formation, Woolwich Formation
Overlies	Thanet Sand, Chalk Group
Thickness	<2–15 m (6.6–49.2 ft)
Lithology
Primary	Sandstone
Location
Coordinates	51.4°N 1.1°E / 51.4; 1.1
Approximate paleocoordinates	45.9°N 1.0°W / 45.9; -1.0
Region	southern England
Country	United Kingdom
Extent	London Basin
Type section
Named for	Upnor
Upnor Formation (England)