Bierton Clay Pit

{{Use dmy dates|date=March 2020}}

{{Infobox SSSI

|image=Bierton Clay Pit 2.JPG

|image_caption=

|name= Bierton Clay Pit

|aos= Buckinghamshire

|interest= Geological

|gridref={{gbmappingsmall| SP839157 }}

|area= 0.1 hectares

|notifydate=1986

|map=[http://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%271000451%27 Magic Map]

}}

Bierton Clay Pit is a {{convert|0.07|hectare|acre|adj=on}} geological Site of Special Scientific Interest in Bierton in Buckinghamshire.{{cite web|url=http://www.sssi.naturalengland.org.uk/citation/citation_photo/1000451.pdf |title=Bierton Clay Pit citation |series=Sites of Special Scientific Interest |publisher=Natural England |accessdate=7 January 2016 |url-status=dead |archiveurl=https://web.archive.org/web/20160125101518/http://www.sssi.naturalengland.org.uk/citation/citation_photo/1000451.pdf |archivedate=25 January 2016 }}{{cite web|url= http://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%271000451%27|title=Map of Bierton Clay Pit|series= Sites of Special Scientific Interest|publisher=Natural England|accessdate= 7 January 2016}} It is listed by the Joint Nature Conservation Committee as a Geological Conservation Review site.{{cite web|url=http://jncc.defra.gov.uk/default.aspx?page=4174&gcr=985|title=Bierton (Portlandian - Berriasian) |publisher=Nature Conservation Committee|accessdate=9 January 2016}}

This disused clay pit exposes a section from the late Jurassic Kimmeridgian and Tithonian stages, between about 157 and 145 million years ago. It is the only exposure of the northern end of the Portland Beds, and shows the relationship between the Beds and the Hartwell Clay. It also gives evidence of a period of erosion followed by a rise in sea level.{{cite web|url=http://www.bucksgeology.org.uk/sssi/bierton_clay_pit.htm|title=Bierton Clay Pit SSSI|publisher=Bucks Geology|accessdate= 7 January 2016}}

The pit is now flooded and no geology is visible. It can be viewed from a footpath between Barnett Way and Brick Kiln Lane.

{{Commons category|Bierton Clay Pit}}