Slinfold Stream and Quarry

{{short description|Site of Special Scientific Interest}}

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

{{Infobox SSSI

|image= Slinfold Stream and Quarry (2).jpg

|image_caption = Slinfold Stream

|name= Slinfold Stream and Quarry

|aos= West Sussex

|interest=Geological

|gridref={{gbmappingsmall|TQ 125 316}}

|area= {{convert|2.3|ha|acre|abbr=off}}

|notifydate= 1990

|map=[https://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%271005577%27 Magic Map]

}}

Slinfold Stream and Quarry is a {{convert| 2.3 |ha|acre|abbr=off |adj=on }} geological Site of Special Scientific Interest west of Horsham in West Sussex.{{cite web|url= https://designatedsites.naturalengland.org.uk/SiteDetail.aspx?SiteCode=S1005577&SiteName=&countyCode=46&responsiblePerson=&SeaArea=&IFCAArea= |title=Designated Sites View: Slinfold Stream and Quarry | series= Sites of Special Scientific Interest|publisher=Natural England|accessdate = 16 April 2019}}{{cite web|url=https://magic.defra.gov.uk/MagicMap.aspx?startTopic=Designations&activelayer=sssiIndex&query=HYPERLINK%3D%271005577%27 |title=Map of Slinfold Stream and Quarry|series= Sites of Special Scientific Interest|publisher=Natural England|accessdate= 16 April 2019}} It is a Geological Conservation Review site.{{cite web|url= http://jncc.defra.gov.uk/default.aspx?page=4174&gcr=2634 |title= Slinfold (Wealden) |series=Geological Conservation Review |publisher=Joint Nature Conservation Committee|accessdate= 6 April 2019}}

This site exposes the Horsham Stone member of the Lower Weald Clay, dating to the Early Cretaceous, around 130 million years ago. It preserves the fossils of horsetails in their upright position, suggesting that they grew in a fresh water reedswamp with a maximum depth of {{convert|2|m|yd|abbr=off}}.{{cite web|url= https://designatedsites.naturalengland.org.uk/PDFsForWeb/Citation/1005577.pdf |title=Slinfold Stream and Quarry citation|series= Sites of Special Scientific Interest|publisher=Natural England|accessdate= 16 April 2019}}

A public footpath goes through a small stretch of the stream bank but the rest of the site is private land with no public access.