Agua Nueva Formation
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| Agua Nueva Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Lithology | |
| Primary | Limestone |
| Other | Shale. bentonite, chert |
| Location | |
| Country | Mexico |
| Extent | San Luis Potosí |
The Agua Nueva Formation is a geologic formation in Mexico. It preserves fossils dated to the latest Cenomanian and Turonian ages of the Cretaceous period. It consists "predominantly of alternating fossiliferous, organic matter-rich, laminated, dark gray limestone and non-laminated, organic matter-poor limestone in decimeter-thick beds (10 to 30 cm) with occasional centimetric beds (5 cm) of brown shale that show no apparent internal structures."[1] The formation is noted for its qualities as a Konservat-Lagerstätte, with notable finds including the plesiosaur Mauriciosaurus, the mosasaur Yaguarasaurus and sharks Ptychodus and Aquilolamna.
It appears to have been deposited on the upper part of a shallow continental shelf.[2]
Cartilaginous fish
Color key
|
Notes Uncertain or tentative taxa are in small text; |
| Cartilaginous fish of the Agua Nueva Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Material | Notes | Images |
| Aquilolamna | A. milarcae | Complete skeleton | A bizarre aquilolamnid shark.[3] |  | ||
| Lamniformes indet. | Articulated vertebrae | An indeterminate mackerel shark, potentially a cretoxyrhinid.[4] | ||||
| Ptychodus | P. decurrens | Vallecillo | Teeth | A ptychodontid shark.[5][6] |  | |
| P. mortoni | Teeth | |||||
| P. sp. | Complete skeletons | |||||
| cf. Scyliorhinus | S. sp. | Articulated vertebrae | A catshark.[7] |  | ||
Ray-finned fish
Based on Amalfitano et al (2020):[8]
| Ray-finned fish of the Agua Nueva Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Material | Notes | Images |
| Araripichthys | A. sp. | An araripichthyid.[2] |  | |||
| Belonostomus | B. sp. | An aspidorhynchid. |  | |||
| Clupeoidei indet. | Huehuetla | A relative of herrings.[9] | ||||
| Enchodus | E. sp. | Huehuetla | An enchodontid aulopiform.[9] |  | ||
| Goulmimichthys | G. roberti | Vallecillo, Huehuetla | A pachyrhizodontid crossognathiform.[2][9] |  | ||
| Hastichthys | H. sp. | Huehuetla | A dercetid aulopiform.[9] | |||
| "Nursallia" | "N." tethysensis | Huehuetla | A pycnodont.[9] |  | ||
| Pachyrhizodus | P. caninus | A pachyrhizodontid crossognathiform. |  | |||
| Paranursallia | P. gutturosa | A pycnodont. |  | |||
| Rhynchodercetis | R. regio | A dercetid aulopiform.[10] |  | |||
| Tingitanichthys | T. sp. | A pachyrhizodontid crossognathiform.[9] | ||||
| Tselfatia | T. formosa | Huehuetla | A plethodid tselfatiiform.[9] |  | ||
| Vallecillichthys | V. multivertebratum | Vallecillo | A saurodontid ichthyodectiform.[2][11] | |||
Lobe-finned fish
| Lobe-finned fish of the Agua Nueva Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Material | Notes | Images |
| Latimerioidei indet. | Gular plate | A large-sized marine coelacanth, potentially Megalocoelacanthus. Originally interpreted as a cephalopod gladius and given the name "Palaeoctopus pelagicus".[12] | ||||
Reptiles
Mosasaurs
| Mosasaurs of the Agua Nueva Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Material | Notes | Images |
| Yaguarasaurus | Y. regiomontanus | A plioplatecarpine mosasaur.[13] |  | |||
Plesiosaurs
| Plesiosaurs of the Agua Nueva Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Material | Notes | Images |
| Mauriciosaurus | M. fernandezi | A polycotylid plesiosaur.[14] |  | |||
Molluscs
Cephalopods
| Cephalopods of the Agua Nueva Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
