Upnor Formation

{{short description|Geological formation in Kent, England}}

{{Infobox rockunit

| name = Upnor Formation

| image = Lambeth Group Gilbert's Pit.jpg

| caption = 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

| age = Thanetian
~{{fossil range|58.7|55.8}}

| period = Thanetian

| prilithology = Sandstone

| otherlithology =

| namedfor = Upnor

| namedby =

| region = southern England

| country = United Kingdom

| coordinates = {{coord|51.4|N|1.1|E|display=inline,title}}

| paleocoordinates = {{coord|45.9|N|1.0|W|display=inline}}

| unitof = Lambeth Group

| subunits = Beltinge Fish Bed

| underlies = Reading Formation, Woolwich Formation

| overlies = Thanet Sand, Chalk Group

| thickness = <{{convert|2|-|15|m|ft|abbr=on}}

| extent = London Basin

| area =

| map = {{Location map+ | England

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | England

| lat_deg = 51.4

| lon_deg = 1.1

| mark = Orange pog.svg

| marksize = 10

}}

}}

| map_caption =

}}

The Upnor Formation is a geological formation found in the London Basin of southeastern England.[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Upnor&group_formation_member=Upnor Upnor Formation] at Fossilworks.org 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.{{cite web | url=http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=UPR | title=Upnor Formation | publisher=British Geological Survey | work=The BGS Lexicon of Named Rock Units | accessdate=31 July 2016}} 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.Hooker & Millbank, 2001