# Coli Toro Formation
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{{Short description|Geologic formation in Argentina}}
{{Infobox rockunit|name=Coli Toro Formation|image=|caption=|type=[Formation](/source/Formation_(geology))|period=Maastrichtian|age=[Maastrichtian](/source/Maastrichtian)-[Danian](/source/Danian)
|prilithology=[Sandstone](/source/Sandstone)|otherlithology=|namedfor=|namedby=|region=[Río Negro Province](/source/R%C3%ADo_Negro_Province)|country=Argentina|coordinates={{coord|41.0|S|69.5|W|display=inline,title}}|paleocoordinates={{coord|43.6|S|55.4|W|display=inline}}|unitof=|subunits=|underlies=|overlies=[Angostura Colorada Formation](/source/Angostura_Colorada_Formation)|thickness=|extent=[Neuquén Basin](/source/Neuqu%C3%A9n_Basin)|area=|map={{Location map+ | Argentina
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | Argentina
| lat_deg = -41.0
| lon_deg = -69.5
| mark = Lightgreen pog.svg
| marksize = 12
}}
}}|map_caption=}}The '''Coli Toro''' '''Formation''' is a [Maastrichtian](/source/Maastrichtian)-[Danian](/source/Danian) geological [formation](/source/Geological_formation) in [Argentina](/source/Argentina). [Dinosaur](/source/Dinosaur) remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific [genus](/source/genus).[Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.] The rocks of the formation were deposited in a marine environment, in opposition to the marginal underliying sedimentary environment.
The formation in later publications has been reassigned as the Coli Toro Member at the basal levels of the [Los Alamitos Formation](/source/Los_Alamitos_Formation), containing fossil remains of ''[Sulcusuchus erraini](/source/Sulcusuchus)''.[[https://paleobiodb.org/classic/displayCollResults?collection_no=142118 Cari-Laufqen Grande Pond] at [Fossilworks](/source/Fossilworks).org] The formation partly overlies the [Angostura Colorada Formation](/source/Angostura_Colorada_Formation).[Ottone, 2009, p.377]
== Fossil content ==
{| class="wikitable"
|+Dinosaurs from the Coli Toro Formation
|-
!Genus
!Species
!Location
!Stratigraphic Position
!Material
!Notes
!Images
|-
|[Hadrosauridae](/source/Hadrosauridae)[{{Cite journal |last1=Paulina-Carabajal |first1=Ariana |last2=Méndez |first2=Ariel |last3=Ulloa-Guaiquin |first3=Karen |last4=González-Dionis |first4=Javier |last5=Irazoqui |first5=Facundo |date=2025 |title=The First Record of Theropod Dinosaur Remains From the Angostura Colorada and Coli Toro Formations (Campanian-Maatrichtian) in the Ingeniero Jacobacci Area (Rio Negro Province, Argentina) |url=https://www.ameghiniana.org.ar/index.php/ameghiniana/libraryFiles/downloadPublic/147 |journal=Ameghiniana |doi=10.5710/AMGH.17.09.2025.3643|url-access=subscription }}]
|Indeterminate
|Cerro Yeso
|
|Isolated caudal vertebrae
|Indeterminated hadrosaurids, probably related to other south american [Austrokritosaurians](/source/Austrokritosauria)
|
|-
|[Titanosauria](/source/Titanosauria)[{{Cite web |last1=Becerra |first1=Marcos G. |last2=Juárez Valieri |first2=R.D |last3=Meso |first3=J.G |last4=Guzmán |first4=F.A |last5=Heredia |first5=J. |date=2024 |title=New remains of ankylosaurs in Río Negro (Argentina) found while revisiting collections in museums expand their presence to new late Cretaceous localities. |url=https://bicyt.conicet.gov.ar/fichas/produccion/11857603 |access-date=October 7, 2025 |website=Conicet}}]
|Indeterminate
|Bajo Colorado
|
|Osteoderm associated to a cranial fragment (MJHG 77-33) and a rib piece (MJHG 271B-17)
|The osteorderm is similar to the jugal-quadratojugal osteoderm of the [La Colonia Parankylosaur](/source/La_Colonia_Formation), and the rib is T-shaped in cross view, as in other parankylosaurs and euankylosaurs
May also be from the [Angostura Colorada Formation](/source/Angostura_Colorada_Formation)
|
|}
{| class="wikitable"
|+Other reptiles from the Coli Toro Formation
|-
!Genus
!Species
!Location
!Stratigraphic Position
!Material
!Notes
!Images
|-
|[Peirosauridae](/source/Peirosauridae) ?[{{Cite journal |last1=O’gorman |first1=José P. |last2=Gasparini |first2=Zulma |date=2013-06-01 |title=Revision of Sulcusuchus erraini (Sauropterygia, Polycotylidae) from the Upper Cretaceous of Patagonia, Argentina |url=https://doi.org/10.1080/03115518.2013.736788 |journal=Alcheringa: An Australasian Journal of Palaeontology |volume=37 |issue=2 |pages=163–176 |doi=10.1080/03115518.2013.736788 |bibcode=2013Alch...37..163O |hdl=11336/2489 |issn=0311-5518|hdl-access=free }}]
|''S. erraini''
|Cerro Yeso and near Laguna Cari-Laufquén Grande
|
|Teeth (Cerro Yeso) and a fragmentary mandibular ramus (Laguna Cari-Laufquén Grande)
|The only named [Polycotylid](/source/Polycotylidae) from the Southern Hemisphere, and the most recent one worldwide. Also found in [La Colonia Formation](/source/La_Colonia_Formation)[{{Cite journal |last1=O’Gorman |first1=José P. |last2=Aspromonte |first2=Franco R. |last3=Matelo Mirco |first3=Gonzalo |title=First record of lithophagy in Sulcusuchus erraini (Plesiosauria; Polycotylidae) with comments on the taphonomic and collect bias in gastroliths |url=https://doi.org/10.1080/08912963.2025.2548329 |journal=Historical Biology |date=2025 |volume=0 |pages=1–13 |doi=10.1080/08912963.2025.2548329 |issn=0891-2963|url-access=subscription }}]
|
|-
|[Testudines](/source/Testudines)