Headon Hill Formation

{{Short description|Geological formation in England}}

{{Use dmy dates|date=April 2022}}

{{Infobox rockunit

| name = Headon Hill Formation

| image =

| caption =

| type = Formation

| age = {{fossilrange|Priabonian}}

| period = Priabonian

| prilithology = clay, silt and sand

| otherlithology = limestone, lignite

| namedfor = Headon Hill

| location_ts = Isle of Wight and South Hampshire

| namedby =

| region = England

| country = United Kingdom

| coordinates =

| unitof = Solent Group

| subunits =

| underlies = Bembridge Limestone Formation

| overlies = Becton Sand Formation

| thickness = 75–90 m

| extent = Isle of Wight and South Hampshire

| area =

| map =

| map_caption =

}}

The Headon Hill Formation is a geological formation found in the Isle of Wight and south Hampshire, England. It preserves fossils dating back to the Priabonian stage (uppermost Eocene).{{Cite web |url=https://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=HEHI |title=Headon Hill Formation |last=British Geological Survey |website=BGS Lexicon of Named Rock Units |access-date=3 November 2018}}