Coordinates: 20°18′S 45°24′E / 20.3°S 45.4°E / -20.3; 45.4

Isalo II

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Isalo II Formation
Stratigraphic range: Ladinian-Carnian
TypeGeological formation
Unit ofIsalo Group
UnderliesIsalo III Formation (unconformity)
OverliesIsalo I Formation
Lithology
PrimarySandstone, mudstone
Location
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Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionMahajanga & Toliara Provinces
CountryMadagascar
ExtentMorondava Basin, Mahajanga Basin
Isalo II is located in Madagascar
Isalo II
Isalo II (Madagascar)

Isalo II, also known as the Makay Formation, is an informal Triassic geological unit in Madagascar.[1]

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.[2]

Fossil content

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Amphibians

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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.[3]
Stereospondyli indet. Interclavicles Indeterminate stereospondyl remains. May be from Isalo II or III.[3]

Reptiles

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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.[4]
Azendohsaurus madagaskarensis[5] Numerous skulls and postcranial fossils[1] An allokotosaurian archosauromorph,[6][7][1] originally mistakenly identified as a "prosauropod" dinosaur.[5]
Isalorhynchus genovefae Numerous fossils representing parts of the skull and postcrania A rhynchosaur sometimes considered a species of Hyperodapedon.[8] Possibly represents two taxa.[9] Reported sphenodontian[5] fossils are most likely juvenile rhynchosaurs instead.[10]
Kongonaphon kely[11] A maxilla and postcranial material A tiny lagerpetid avemetatarsalian[12]
Mambachiton fiandohana[13] A partial skeleton An armored basal avemetatarsalian[14]
Phytosauria indet. Teeth Similar to Rutiodon teeth.[4]
Procolophonidae sp. A jaw fragment and other remains An unnamed procolophonid parareptile[8]
Pseudosuchia indet. Osteoderms Likely referable to stagonolepid aetosaurs, though similar to goniopholidid crocodylomorphs as well.[4]
Silesauridae sp. An unnamed silesaurid dinosauromorph[14]

Synapsids

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Synapsids
Taxon Material Notes
Chiniquodon kalanoro[15] Part of a jaw A chiniquodontid cynodont
Dadadon isaloi[16] Several skulls and jaw fragments[17][18] A massetognathine[18] traversodontid cynodont
Kannemeyeriiformes sp. An unnamed kannemeyeriiform dicynodont[5][15][1]
Menadon besairiei[16] Skulls, jaws, and postcranial material[19] A traversodontid cynodont

References

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  1. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ Brenon, P. (1972). The Geology of Madagascar. In: Battistini, R., Richard-Vindard, G. (eds) Biogeography and Ecology in Madagascar. Monographiae Biologicae, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7159-3_2
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