Isalo II

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

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	20.3°S 45.4°E / -20.3; 45.4
Approximate paleocoordinates	23.1°S 24.7°E / -23.1; 24.7
Region	Mahajanga & Toliara Provinces
Country	Madagascar
Extent	Morondava Basin, Mahajanga Basin
Isalo II (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.^[2]

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

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.[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

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