View source for Earth:El Doctor Formation

{{Infobox rockunit
| name           = El Doctor Formation
| image          =
| caption        =
| type           = Formation
| period         = Cenomanian
| age            = [[Earth:Albian|Albian]]-[[Earth:Cenomanian|Cenomanian]]<br>~{{fossil range|112|95}}
| prilithology   = Lime mudstone
| otherlithology = 
| namedfor       = 
| namedby        = 
| region         = Hidalgo
| country        = {{MEX}}
| coordinates    = {{coord|20.8|N|99.3|W|display=inline,title}}
| paleocoordinates = {{coord|18.9|N|64.5|W|display=inline}}
| unitof         = 
| subunits       = La Negra Member
| underlies      = 
| overlies       = 
| thickness      = 
| extent         = 
| area           = 
| map            =  {{Location map+ | Mexico#Mexico Hidalgo
| relief = 1
| width   = 250
| float   = center
| places  =
  {{Location map~ | Mexico#Mexico Hidalgo
  | lat_deg = 20.8
  | lon_deg = -99.8
  | mark = Green pog.svg
  | marksize = 10
  }}
}}
| map_caption    = 
}}

The '''El Doctor Formation''' is a geologic formation in Mexico. It preserves fossils dating back to the [[Earth:Albian|Albian]] and [[Earth:Cenomanian|Cenomanian]] stages of the [[Earth:Cretaceous|Cretaceous]] period.<ref name=FW>[http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=135815 El Doctor Formation] at [[Biology:Fossilworks|Fossilworks]].org</ref>

== Description ==
The light grey micritic limestone sequence with intercalated black chert lenses was deposited in an open marine basin with a hypersaline and/or poorly oxygenated bottom.<ref name=FW/>

== Fossil content ==
The formation has provided the following fossils:<ref name=FW/><ref name=Feldmann2007>Feldmann et al., 2007</ref>
;Fish
* ''[[Biology:Enchodus|Enchodus zipapanensis]]''<ref name=Fielitz2010>Fielitz & González Rodríguez, 2010</ref>
;Crustaceans
* ''[[Biology:Aeger|Aeger hidalguensis]]''
* ''Polzia eldoctorensis''<ref name=Hegna2014>Hegna et al., 2014</ref>
* ''Victoriacaris muhiensis''<ref name=Hegna2014/>
* ''Palinurus sp.''

== See also ==
* List of fossiliferous stratigraphic units in Mexico
** Sierra Madre Formation

== References ==
{{reflist|2}}

=== Bibliography ===
* {{cite LSA |last=Hegna |first=T. A. |first2=F. J. |last2=Vega |first3=K. A. |last3=González Rodríguez |year=2014 |title=First Mesozoic thylacocephalans (Arthropoda, Crustacea; Cretaceous) in the western hemisphere: new discoveries from the Muhi Quarry Lagerstätte |journal=Journal of Paleontology |volume=88 |pages=606–616}}
* {{cite LSA |last=Fielitz |first=C. |first2=K. A. |last2=González Rodríguez |year=2010 |title=A New Species of ''Enchodus'' (Aulopiformes: Enchodontidae) from the Cretaceous (Albian to Cenomanian) of Zimapán, Hidalgo, México |journal=Journal of Vertebrate Paleontology |volume=30 |pages=1343–1351}}
* {{cite LSA |last=Feldmann |first=R. M. |first2=F. J. |last2=Vega |first3=L. |last3=Martínez López |first4=K. A. |last4=González Rodrigues |first5=O. |last5=González León |first6=M. |last6=Rosario Fernández-Barajas |year=2007 |title=Crustacea from the Muhi Quarry (Albian-Cenomanian), and a review of Aptian Mecochiridae (Astacidea) From Mexico |journal=Annals of Carnegie Museum |volume=76 |pages=145–156}}

[[Category:Albian Stage]]
[[Category:Cenomanian Stage]]
[[Category:Mudstone formations]]
[[Category:Deep marine deposits]]

{{Sourceattribution|El Doctor Formation}}