Downton Castle Sandstone

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

{{Infobox rockunit

| name = Downton Castle Sandstone

| image =

| caption =

| type = Formation

| age = Silurian {{fossilrange|Pridoli}}

| period = Pridoli

| prilithology = Sandstone

| otherlithology = Siltstone, Mudstone

| namedfor =

| namedby =

| region = England

| country = {{UK}}

| coordinates =

| unitof = Old Red Sandstone

| subunits = Lower Bone Bed Member, Platyschisma Shale Member

| underlies = Temeside Shale

| overlies =

| thickness = 15m in type area; 17m at Ludlow, 15-20m in South Staffordshire

| extent =

| area =

| map =

| map_caption =

}}

The Downton Castle Sandstone is a geologic formation in England. It preserves fossils dating back to the Silurian period. As its name would suggest the formation predominantly consists of sandstone with minor siltstone and mudstone.{{cite web |url= http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=DCS|title= Downton Castle Sandstone Formation|last= |first= |date= |publisher= British Geological Survey|work = BGS Lexicon of Named Rock Units|access-date= 24 September 2019|quote=}} The oldest known Trigonotarbid Palaeotarbus is known from the formation.