Kartikeyar: done

2025-07-11T11:51:52Z

done

New page

{{Short description|Geologic formation in Tamil Nadu, India}}
{{Infobox rockunit
| name = Sillakkudi formation
| period = [[Cretaceous]]
| age = Early [[Campanian]] <br />~{{fossil range|82|78}}
| image =
| imagesize =
| caption =
| type = [[Geological formation]]
| prilithology = [[Sandstone]]
| otherlithology =
| unitof = [[Ariyalur Group]]
| subunits =
| underlies = [[Kallakurichi Formation]]
| overlies = [[Anaipadi Formation]]
| thickness = 
| area =

| location = Sillakkudi
| coordinates =
| region = [[Tamil Nadu]]
| country = [[India]]
| extent = 

| namedfor = 
| namedby = 
| year_ts = 
| location_ts = 
| coordinates_ts = {{Coord|11|05|50|N|79|02|15|E|display=inline,title}}
| paleocoordinates_ts = 
| region_ts = 
| country_ts = 
| thickness_ts = 
| map = {{Location map+ | India#Tamil Nadu
| map_caption = Location of the Sillakkudi formation in [[India]]| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | India#Tamil Nadu
| lat_deg = 11.1
| lon_deg = 79.1
| mark = Lightgreen pog.svg
| marksize = 10
}}
}}
| map_caption =
}}
The '''Sillakkudi Formation''' is a [[Late Cretaceous]] ([[Campanian]]) [[geological formation]] located in [[Tamil Nadu]], [[India]] it forms part of the [[Ariyalur Group]]. It dates to the Campanian of the Late Cretaceous.<ref>{{Cite journal |last=Bakkiaraj |first=D. |last2=Nagendra |first2=R. |last3=Nagarajan |first3=R. |last4=Armstrong-Altrin |first4=John S. |date=2010 |title=Geochemistry of sandstones from the Upper Cretaceous Sillakkudi Formation, Cauvery Basin, southern India: Implication for provenance |url=http://link.springer.com/10.1007/s12594-010-0128-3 |journal=Journal of the Geological Society of India |language=en |volume=76 |issue=5 |pages=453–467 |doi=10.1007/s12594-010-0128-3 |issn=0016-7622|hdl=20.500.11937/18718 |hdl-access=free }}</ref><ref>{{Cite journal |last=Paranjape |first=Amruta R. |last2=Kulkarni |first2=Kantimati G. |last3=Kale |first3=Anand S. |date=2023 |title=Facies and trace fossils of the Upper Cretaceous Sillakudi Formation (Cauvery Basin, S. India) and their palaeoenvironmental significance |url=https://journals.sagepub.com/doi/10.1177/05529360231205315 |journal=Journal of the Palaeontological Society of India |language=en |volume=68 |issue=2 |pages=262–272 |doi=10.1177/05529360231205315 |issn=0552-9360|doi-access=free }}</ref>

==Description==
The formation was deposited in a Shallow Marine setting as it shows signs of a mobile deposition of substrate. The diversity of the Mollusc fauna of the formation also indicates a shallow marine deposition.<ref name=":0">{{Cite web |title=Sillakkudi Formation |url=https://indplex.geolex.org/displayInfo.php?formation=Sillakkudi%20Fm |access-date=2024-12-15 |website=indplex.geolex.org}}</ref>

== Fossil content ==
Lamellibranchs and echinoid fragments have been reported from the Sillakkudi formation.<ref name=":0" />

{| class="wikitable" align="center"
|-
! colspan="5" align="center" | '''[[Mollusc]]s from the Sillakkurdi formation'''
|-
! Genus !! Species !! Material !! Notes !! Member
|-
|''[[Inoceramus]]''<ref name=":0" />
|''I''. sp.
|
|
|
|-
|''[[Karapadites]]''<ref name=":0" />
|''K. karapadense''
|
|
|
|}
{| class="wikitable" align="center"
|-
! colspan="6" align="center" | '''[[Foraminifera]]s from the Sillakkudi formation'''
|-
! Genus
! !! Species !! Material !! Notes !! Member
|-
| rowspan="3" |''Globotruncana''
|G. arca<ref name=":0" />
|
|
|
|-
|''G. ventricosa''<ref name=":0" />
|
|
|
|-
|''G. elevata''<ref name=":0" />
|
|
|
|-
|}

==References==
{{Reflist}}

[[Category:Late Cretaceous]]
[[Category:Geologic formations of India]]

Sillakkudi Formation - Revision history

Kartikeyar: done