Ferruginous Sands

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

{{Infobox rockunit

| name = Ferruginous Sands

| image = Chale Bay (geograph 4086382).jpg

| caption = The Ferruginous Sands at Chale Bay, Isle of Wight

| type = Formation

| age = Early Cretaceous,
~{{fossilrange|116}}

| period = Aptian

| prilithology = Weakly cemented Mudstone and Sandstone

| otherlithology =

| namedfor =

| namedby =

| region = England

| country = United Kingdom

| coordinates =

| unitof = Lower Greensand Group

| subunits =Member IV, Member V, Member VI, Whale Chine Member, Member VIII, Ladder Chine Member, Member X, Member XI, Old Walpen Chine Member, New Walpen Chine Member, Member XIV and Member XV.

| underlies = Sandrock Formation

| overlies = Atherfield Clay Formation

| thickness = up to 161 metres

| extent = Isle of Wight, Dorset

| area =

| map =IOW_geology.svg

| map_caption =Exposure of the Ferruginous Sands on the Isle of Wight, shown in Spring green

}}

The Ferruginous Sands is a geologic formation in England. It preserves fossils dating back to the Aptian Stage of the Cretaceous period. It consists of "a number of heavily bioturbated coarsening-upward units each comprising dark grey sandy muds or muddy sands passing up into fine-to medium-grained grey to green glauconitic sands."{{Cite web|last=|first=|date=|title=Ferruginous Sands Formation|url=http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=FRS|access-date=|website=The BGS Lexicon of Named Rock Units|publisher=British Geological Survey}} The dinosaur Vectaerovenator inopinatus is known from the formation.{{Cite journal|title=Dryad Data -- Data from: A highly pneumatic 'mid Cretaceous' theropod from the British Lower Greensand|year=2020 |url=https://datadryad.org/stash/dataset/doi:10.5061/dryad.8cz8w9gmj|language=en|doi=10.5061/dryad.8cz8w9gmj|last1=Barker |first1=Chris |last2=Naish |first2=Darren |last3=Clarkin |first3=Claire |last4=Hullman |first4=Gabriel |last5=Schneider |first5=Philipp |last6=Gostling |first6=Neil |last7=Farrell |first7=Paul |last8=Ward |first8=Robin |last9=Lockyer |first9=James |publisher=Dryad }} Shark teeth are also known from the formation, including those of an indeterminate lamniform shark and Palaeospinax (formerly Synechodus).{{Cite journal|last1=Batchelor|first1=Trevor J.|last2=Duffin|first2=Christopher J.|date=July 2019|title=First description of sharks' teeth from the Ferruginous Sands Formation (Aptian, Early Cretaceous) of the Isle of Wight|url=https://linkinghub.elsevier.com/retrieve/pii/S0016787819300598|journal=Proceedings of the Geologists' Association|volume=131 |issue=3–4 |language=en|pages=353–359|doi=10.1016/j.pgeola.2019.06.004|s2cid=199107658 |url-access=subscription}}