Lohan Cura Formation
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Candeleros Formation
La Amarga, Agrio & Bajada Colorada Formations
| Lohan Cura Formation | |
|---|---|
| Stratigraphic range: Late Aptian-Albian ~ | |
 | |
| Type | Geological formation |
| Sub-units | Puesto Quiroga & Cullín Grande Members |
| Underlies | Río Limay Subgroup Candeleros Formation |
| Overlies | Mendoza Group La Amarga, Agrio & Bajada Colorada Formations |
| Thickness | 177 m (581 ft) |
| Lithology | |
| Primary | Mudstone, siltstone, sandstone |
| Other | Claystone |
| Location | |
| Coordinates | 39°36′S 69°24′W / 39.6°S 69.4°W |
| Approximate paleocoordinates | 43°42′S 39°24′W / 43.7°S 39.4°W |
| Region | Río Negro Province, Mendoza Province, Neuquén Province |
| Country | Argentina |
| Extent | Neuquén Basin |
| Type section | |
| Named by | Leanza & Hugo |
| Year defined | 1995 |
  Lohan Cura Formation (Argentina) | |
The Lohan Cura Formation is a geologic formation with outcrops in the Argentine provinces of Río Negro, Neuquén, and Mendoza. It is the second oldest Cretaceous terrestrial formation in the Neuquén Basin.
The Lohan Cura Formation unconformably overlies the terrestrial La Amarga Formation. In some places it also overlies the older marine Agrio and Bajada Colorada Formations of the Mendoza Group through the same Middle Miranican unconformity. It is in turn overlain by the Candeleros Formation of the Neuquén Group, separated by the Main Miranican unconformity. The Lohan Cura correlates with the Rayoso Formation in some areas.[1]
The Lohan Cura Formation contains two members of roughly equal thickness. The lowermost member, Puesto Quiroga Member is approximately 85 metres (279 ft) thick. The lowest sediments in this unit are conglomerates, overlain by sandstones and siltstones. The upper two-thirds of the member consists mainly of shales. The Cullín Grande Member is the upper member within the formation, about 92 metres (302 ft) thick, which contains numerous sandstones displaying evidence of stream channels. Near the top of the sequence, siltstones and claystones become dominant.
Fossil content
| Dinosaurs of the Lohan Cura Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
| Agustinia[2] | A. ligabuei | Neuquén Province | Dorsal sacral and caudal neural arches, hindlimb elements, and pelvic fragments (the latter misidentified as osteoderms) |  |
| Comahuesaurus[3] | C. windhauseni | Neuquén Province | "At least three individuals" | |
| Ligabuesaurus[4] | L. leanzai | Neuquén Province | Partial skull and postcranial remains | |
| Limaysaurus[5] | L. sp. | Neuquén Province | Single tooth and postcranial materials, at least from 3 individuals | |
| Pterosaurs of the Lohan Cura Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
| Ornithocheiriformes[6] | Indeterminate | Neuquén Province | "Isolated teeth" | |
