Sierra Barrosa Formation
| Sierra Barrosa Formation | ||
|---|---|---|
Ma | ||
| Type | Approximate paleocoordinates 42°48′S 48°24′W / 42.8°S 48.4°W | |
| Region | Mendoza & Neuquén Provinces | |
| Country |  Argentina | |
| Extent | Neuquén Basin | |
| Type section | ||
| Named for | Sierra Barrosa | |
| Named by | 2010 | |
| Year defined | Garrido | |
  Sierra Barrosa Formation (Argentina) | ||
The Sierra Barrosa Formation is a
fluvial environment
.
Description
The formation was named by Garrido in 2010 as sandy unit conformably and transitionally overlying the Los Bastos Formation, which in turns overlies the Portezuelo Formation within which both units were formerly included. The formation in the same manner underlies the Plottier Formation, all belonging to the Río Neuquén Subgroup of the Neuquén Group in the Neuquén Basin. The unit now known as Sierra Barrosa Formation was included in the original definition by Herrero Ducloux (1938, 1939) as "Portezuelo Superior", as part of the "Portezuelo Beds" he described.[1]
The type locality of the formation is located at the southern edge of the eponymous
fluvial environment characterized by highly sinuous channels. Based on the stratigraphic relations with the overlying and underlying units, the age has been estimated to be middle to late Coniacian.[1]
Fossil content
Crocodylomorphs
Crocodylomorphs reported from the Sierra Barrosa Formation
| |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Comahuesuchus | C. bonapartei | Futalongko Quarry.[2] | Partial right mandible (MUCPv 597).[2] | A notosuchian, locality may being to the Portezuelo Formation .
|
 |
Dinosaurs
Ornithischians
| Ornithischians reported from the Sierra Barrosa Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Macrogryphosaurus | M. gondwanicus | Mari Menuco Lake.[3]
|
Near-complete skeleton.[3] | An elasmarian .
|
 |
Sauropods
Sauropods reported from the Sierra Barrosa Formation
| |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Kaijutitan | K. maui | Cañadón Mistringa.[4] | Partial skeleton.[4] | A titanosaur .
|
|
| Mendozasaurus | M. neguyelap | Arroyo Seco.[5][6] | Partial skeleton and disarticulated bones.[5][6] | A titanosaur .
|
|
Theropods
Theropods reported from the Sierra Barrosa Formation
| |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Allosauroidea indet. | Indeterminate | Cañadón Mistringa.[7] | Proximal end of left tibia (MAU-PV-CM-653).[7] | An allosauroid .
|
|
| Maniraptora indet. | Indeterminate | Arroyo Seco.[6] | A maniraptoran. | ||
| Murusraptor | M. barrosaensis | Sierra Barrosa.[8] | Partial skeleton (MCF-PVPH-411).[8] | A megaraptorid .
|
 |
See also
- List of dinosaur bearing rock formations
References
- ^ a b Alberto, Garrido (May 2011). "El Grupo Neuquén (Cretácico Tardío) en la Cuenca Neuquina". 18º Congreso Geológico Argentino (in Spanish): 231–244.
- ^ S2CID 260910113.
- ^ S2CID 213679041.
- ^ S2CID 134843807.
- ^ hdl:10044/1/53967.
- ^ a b c González Riga, B. J. (2003). "A new titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous of Mendoza Province, Argentina". Ameghiniana. 40: 155–172.
- ^ S2CID 246334899.
- ^ PMID 27439002.