Bajo Barreal Formation

{{Infobox rockunit

| name = Bajo Barreal Formation

| image =

| caption =

| type = Geological formation

| age = Mid Cenomanian-Late Turonian
~{{fossil range|97|90}}

| period = Turonian

| prilithology = Sandstone

| otherlithology = Claystone, mudstone, conglomerate, tuff

| namedfor =

| namedby = Teruggi & Rossetto

| year_ts = 1963

| region = Chubut, Santa Cruz

| country = Argentina

| coordinates = {{coord|45.3|S|69.6|W|display=inline,title}}

| paleocoordinates = {{coord|51.6|S|46.7|W|display=inline}}

| unitof = Chubut Group

| subunits =

| underlies = Lago Colhué Huapí Formation

| overlies = Castillo Formation

| thickness =

| extent = Golfo San Jorge Basin

| area =

| map = {{Location map+ | Argentina

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | Argentina

| lat_deg = -45.3

| lon_deg = -69.6

| mark = Lightgreen pog.svg

| marksize = 12

}}

| map_caption =

}}

The Bajo Barreal Formation is a geological formation in the Golfo San Jorge Basin of Chubut and Santa Cruz, Argentina whose strata date back to the Middle Cenomanian to Late Turonian. The formation was first described by Teruggi & Rossetto in 1963.Casal et al., 2016, p.55 The sandstones, claystones, mudstones, conglomerates and tuff were deposited in a fluvial environment.[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Bajo%20Barreal&group_formation_member=Bajo%20Barreal Bajo Barreal Formation] at Fossilworks.org The upper part of formation is laterally equivalent to the Yacimiento El Trébol and Meseta Espinosa Formation and the lower part to the Laguna Palacios, Cañadón Seco and Comodoro Rivadavia Formations. The Bajo Barreal Formation is a reservoir rock in the Golfo San Jorge Basin.Sywan, 2001, p.131

Vertebrate paleofauna

= Dinosaurs =

Indeterminate abelisauroids and titanosaurs have been recovered from the formation

== Ornithopods ==

colspan="6" align="center" \| Ornithopods reported from the Bajo Barreal Formation
class="wikitable" align="center"
Genus	Species	Stratigraphic position	Material	Notes	Images
Notohypsilophodon \| N. comodorensis \| Lower \| "Vertebrae, partial fore- and hindlimb""Table 18.1," in Weishampel, et al. (2004). Page 395. \| An elasmarian ornithopod. \| File: Notohypsilodon reconstruction raingerr.png

== Sauropods ==

colspan="6" align="center" \| Sauropods reported from the Bajo Barreal Formation
class="wikitable" align="center"
Genus	Species	Stratigraphic position	Material	Notes	Images
Andesaurus \|A. sp. \|Lower \| \|The most basal member of Titanosauria \|frameless
CampylodoniscusHaubold, H. & Kuhn, O., 1961, Lebensbilder und Evolution fossiler Saurier, Amphibien und Reptilien, Wittenberg : Ziemsen \| C. ameghinoi \| Lower \| Maxilla with seven teeth.Huene, F. von, 1929, "Los Saurisquios y Ornitisquios del Cretaceo Argentino", Anales del Museo de La Plata, 3(2): 82-83 \| \| File:Campylodoniscus ameghinoi Skull Mk I Me.jpg
DrusilasauraCésar Navarrete, Gabriel Casal and Rubén Martínez (2011). "Drusilasaura deseadensis gen. et sp. nov., a new titanosaur (Dinosauria-Sauropoda), of the Bajo Barreal Formation, Upper Cretaceous of north of Santa Cruz, Argentina". Revista Brasileira de Paleontologia 14 (1): 1-14. {{doi\|10.4072/rbp.2011.1.01}}. \| D. deseadensis \| Upper \| "four dorsal vertebrae, one sacral vertebra, six caudal vertebrae, left scapula, dorsal rib fragments, two haemapophyses and indeterminate fragments" \| A titanosaur belonging to Lognkosauria \| File:Drusilasaura.png
Epachthosaurus \| E. sciuttoi \| Lower \| "Vertebrae [and] partial illium.""Table 13.1," in Weishampel, et al. (2004). Page 268. \| \|thumb
Katepensaurus \|K. goicoecheai \|Lower \|Partial skeleton \|A rebbachisaurid \|frameless
Rebbachisauridae{{Cite journal\|last1=Ibiricu\|first1=Lucio M.\|last2=Casal\|first2=Gabriel A.\|last3=Martínez\|first3=Rubén D.\|last4=Alvarez\|first4=Bruno N.\|last5=Poropat\|first5=Stephen F.\|date=2020\|title=New materials and an overview of Cretaceous vertebrates from the Chubut Group of the Golfo San Jorge Basin, central Patagonia, Argentina\|journal=Journal of South American Earth Sciences\|language=en\|volume=98\|pages=102460\|doi=10.1016/j.jsames.2019.102460\|bibcode=2020JSAES..9802460I\|s2cid=212808289 }} \|Indeterminate \|Lower \|Dorsal vertebra \|Different from Katepensaurus. \|
SarmientosaurusMartínez et al., 2016 \| S. musacchioi \| Lower \| A skull \| A lithostrotian titanosaur with a skull similar to Brachiosaurus \| File:Cranium of Sarmientosaurus.PNG

== Theropods ==

colspan="6" align="center" \| Theropods reported from the Bajo Barreal Formation
class="wikitable" align="center"
Genus	Species	Stratigraphic position	Material	Notes	Images
Abelisauridae \|Indeterminate \|Lower \|Maxilla \|Possibly distinct from Xenotarsosaurus. Estimated to be {{Convert\|6.21\|m\|ft\|abbr=}} long, larger than Xenotarsosaurus.{{Cite journal\|last1=Grillo\|first1=Orlando Nelson\|last2=Delcourt\|first2=Rafael\|date=2017-01-01\|title=Allometry and body length of abelisauroid theropods: Pycnonemosaurus nevesi is the new king\|url=http://www.sciencedirect.com/science/article/pii/S0195667116301902\|journal=Cretaceous Research\|language=en\|volume=69\|pages=71–89\|doi=10.1016/j.cretres.2016.09.001\|bibcode=2017CrRes..69...71G \|issn=0195-6671}} \|
Abelisauridae{{Cite journal\|last=Lamanna\|first=Matthew C.\|date=2012\|title=A new abelisaurid (Theropoda: Ceratosauria) skeleton from the Upper Cretaceous Bajo Barreal Formation of Chubut Province, Argentina.\|url=http://vertpaleo.org/GlobalPDFS/SVP-Abstract-Book_12_web_back.aspx\|journal=Journal of Vertebrate Paleontology\|volume=32\|issue=Supplement 2\|pages=124}} \| \|Lower \|partial skeleton \|Different from all other comparable abelisaurids, but can't be compared with Xenotarsosaurus. \|
Aniksosaurus"63.2 Provincia de Chubut, Argentina; 2. Bajo Barreal Formation," in Weishampel, et al. (2004). Page 602. \| A. darwini \| Lower \| \| A basal coelurosaur \| File:Aniksosaurus.png
Megaraptoridae{{Cite journal\|last1=Lamanna\|first1=Matthew C.\|last2=Casal\|first2=Gabriel A.\|last3=Martínez\|first3=Rubén D. F.\|last4=Ibiricu\|first4=Lucio M.\|title=Megaraptorid (Theropoda: Tetanurae) Partial Skeletons from the Upper Cretaceous Bajo Barreal Formation of Central Patagonia, Argentina: Implications for the Evolution of Large Body Size in Gondwanan MegaraptoranS\|date=2020-11-30\|url=https://www.researchgate.net/publication/346643017\|journal=Annals of Carnegie Museum\|volume=86\|issue=3\|pages=255–294\|doi=10.2992/007.086.0302\|s2cid=229355207}} \|Indeterminate \| Upper part of lower Lowermost part of upper \|Two partial skeletons \| \|
Xenotarsosaurus \| X. bonapartei \| Lower \| A vertebra and a nearly complete hind limb"Table 3.1," in Weishampel, et al. (2004). Page 49. \| An abelisaur. \| File:Xenotarsosaurus lower leg.jpg

;Other fossils

Other fossils found in the formation include:Casal, 2016, p.58[https://paleobiodb.org/classic/displayCollResults?collection_no=152253 Estancia Laguna Palacios "2005 Quarry"] at Fossilworks.org[https://paleobiodb.org/classic/displayCollResults?collection_no=38952 6 km north of Estancia "Ocho Hermanos"] at Fossilworks.org

References

= Bibliography =

{{citation |last1=Casal |first1=Gabriel A. |last2=Martínez |first2=Ruben D. |last3=Luna |first3=Marcelo |last4=Ibiricu |first4=Lucio M. |year=2016 |title=Ordenamiento y caracterización faunística del Cretácico Superior del Grupo Chubut, Cuenca del Golfo San Jorge, Argentina |url=http://www.sbpbrasil.org/assets/uploads/files/rbp19-1/05_Casal%20et%20al_pg53a70_wb.pdf |journal=Revista Brasileira de Paleontologia |volume=19 |pages=53–70 |doi=10.4072/rbp.2016.1.05 |accessdate=2019-02-16}}
{{citation |last1=Martínez |first1=Rubén D.F. |last2=Lamanna |first2=Matthew C. |author3-link=Fernando Novas |last3=Novas |first3=Fernando E. |last4=Ridgely |first4=Ryan C. |last5=Casal |first5=Gabriel A. |last6=Martínez |first6=Javier E. |last7=Vita |first7=Javier R. |last8=Witmer |first8=Lawrence M. |year=2016 |title=A Basal Lithostrotian Titanosaur (Dinosauria: Sauropoda) with a Complete Skull: Implications for the Evolution and Paleobiology of Titanosauria |journal=PLoS ONE |volume=11 |issue=4 |pages=e0151661 |doi=10.1371/journal.pone.0151661 |doi-access=free |pmid=27115989 |pmc=4846048 |bibcode=2016PLoSO..1151661M |hdl=11336/17517 |hdl-access=free }}
{{citation |last=Sylwan |first=Claudio A |year=2001 |title=Geology of the Golfo San Jorge Basin, Argentina |url=http://revistas.ucm.es/index.php/JIGE/article/viewFile/JIGE0101110123A/32860 |journal=Journal of Iberian Geology |volume=27 |pages=123–157 |accessdate=2018-09-04}}
{{citation |last1=Weishampel |first1=David B. |author2-link=Peter Dodson |last2=Dodson |first2=Peter |author3-link=Halszka Osmólska |last3=Osmólska |first3=Halszka |year=2004 |title=The Dinosauria, 2nd edition |url=https://books.google.com/books?id=vtZFDb_iw40C |publisher=Berkeley: University of California Press |pages=1–880 |accessdate=2019-02-21 |isbn=0-520-24209-2 |author1-link=David B. Weishampel }}

colspan="6" align="center" \| Sauropods reported from the Bajo Barreal Formation
class="wikitable" align="center"
Genus	Species	Stratigraphic position	Material	Notes	Images
Andesaurus \|A. sp. \|Lower \| \|The most basal member of Titanosauria \|frameless
CampylodoniscusHaubold, H. & Kuhn, O., 1961, Lebensbilder und Evolution fossiler Saurier, Amphibien und Reptilien, Wittenberg : Ziemsen \| C. ameghinoi \| Lower \| Maxilla with seven teeth.Huene, F. von, 1929, "Los Saurisquios y Ornitisquios del Cretaceo Argentino", Anales del Museo de La Plata, 3(2): 82-83 \| \| File:Campylodoniscus ameghinoi Skull Mk I Me.jpg
DrusilasauraCésar Navarrete, Gabriel Casal and Rubén Martínez (2011). "Drusilasaura deseadensis gen. et sp. nov., a new titanosaur (Dinosauria-Sauropoda), of the Bajo Barreal Formation, Upper Cretaceous of north of Santa Cruz, Argentina". Revista Brasileira de Paleontologia 14 (1): 1-14. {{doi\|10.4072/rbp.2011.1.01}}. \| D. deseadensis \| Upper \| "four dorsal vertebrae, one sacral vertebra, six caudal vertebrae, left scapula, dorsal rib fragments, two haemapophyses and indeterminate fragments" \| A titanosaur belonging to Lognkosauria \| File:Drusilasaura.png
Epachthosaurus \| E. sciuttoi \| Lower \| "Vertebrae [and] partial illium.""Table 13.1," in Weishampel, et al. (2004). Page 268. \| \|thumb
Katepensaurus \|K. goicoecheai \|Lower \|Partial skeleton \|A rebbachisaurid \|frameless
Rebbachisauridae{{Cite journal\|last1=Ibiricu\|first1=Lucio M.\|last2=Casal\|first2=Gabriel A.\|last3=Martínez\|first3=Rubén D.\|last4=Alvarez\|first4=Bruno N.\|last5=Poropat\|first5=Stephen F.\|date=2020\|title=New materials and an overview of Cretaceous vertebrates from the Chubut Group of the Golfo San Jorge Basin, central Patagonia, Argentina\|journal=Journal of South American Earth Sciences\|language=en\|volume=98\|pages=102460\|doi=10.1016/j.jsames.2019.102460\|bibcode=2020JSAES..9802460I\|s2cid=212808289 }} \|Indeterminate \|Lower \|Dorsal vertebra \|Different from Katepensaurus. \|
SarmientosaurusMartínez et al., 2016 \| S. musacchioi \| Lower \| A skull \| A lithostrotian titanosaur with a skull similar to Brachiosaurus \| File:Cranium of Sarmientosaurus.PNG