Isalo II
| Isalo II Formation | |
|---|---|
| Stratigraphic range: Ladinian-Carnian | |
| Type | Geological formation |
| Unit of | Isalo Group |
| Underlies | Isalo III Formation (unconformity) |
| Overlies | Isalo I Formation |
| Lithology | |
| Primary | Sandstone, mudstone |
| Location | |
| Coordinates | 20°18′S 45°24′E / 20.3°S 45.4°E |
| Approximate paleocoordinates | 23°06′S 24°42′E / 23.1°S 24.7°E |
| Region | Mahajanga & Toliara Provinces |
| Country | Madagascar |
| Extent | Morondava Basin, Mahajanga Basin |
  Isalo II (Madagascar) | |
Isalo II, also known as the Makay Formation, is an informal Triassic geological unit in Madagascar.
It is described as "thick beds of mottled red or green clays associated with soft cross-bedded sandstones, light in colour and much finer-grained than the Isalo I sandstones." It is prominent in the Makay Massif.
Fossil content
Amphibians
| Amphibians | ||
|---|---|---|
| Taxon | Material | Notes |
| Metoposauridae indet. | An interclavicle, skull fragments, and intercentra | Indeterminate metoposaurid remains similar to those of Indian metoposaurids. Some fossils were the basis for the dubious species "Metoposaurus hoffmani". May be from Isalo II or III. |
| Stereospondyli indet. | Interclavicles | Indeterminate stereospondyl remains. May be from Isalo II or III. |
Reptiles
| Synapsids | ||
|---|---|---|
| Taxon | Material | Notes |
| Archosauriformes sp. | Teeth, a coracoid, a centrum fragment, and cranial fragments | Various indeterminate fragments, some of which may belong to dinosaurs. |
| Azendohsaurus madagaskarensis | Numerous skulls and postcranial fossils | An allokotosaurian archosauromorph, originally mistakenly identified as a "prosauropod" dinosaur. |
| Isalorhynchus genovefae | Numerous fossils representing parts of the skull and postcrania | A rhynchosaur sometimes considered a species of Hyperodapedon. Possibly represents two taxa. Reported sphenodontian fossils are most likely juvenile rhynchosaurs instead. |
| Kongonaphon kely | A maxilla and postcranial material | A tiny lagerpetid avemetatarsalian |
| Mambachiton fiandohana | A partial skeleton | An armored basal avemetatarsalian |
| Phytosauria indet. | Teeth | Similar to Rutiodon teeth. |
| Procolophonidae sp. | A jaw fragment and other remains | An unnamed procolophonid parareptile |
| Pseudosuchia indet. | Osteoderms | Likely referable to stagonolepid aetosaurs, though similar to goniopholidid crocodylomorphs as well. |
| Silesauridae sp. | An unnamed silesaurid dinosauromorph | |
Synapsids
| Synapsids | ||
|---|---|---|
| Taxon | Material | Notes |
| Chiniquodon kalanoro | Part of a jaw | A chiniquodontid cynodont |
| Dadadon isaloi | Several skulls and jaw fragments | A massetognathine traversodontid cynodont |
| Kannemeyeriiformes sp. | An unnamed kannemeyeriiform dicynodont | |
| Menadon besairiei | Skulls, jaws, and postcranial material | A traversodontid cynodont |