Tiki microvertebrate locality: Carnian, India
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Morganucodonta
- Morganucodontidae
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Gondwanadon tapani n. gen., n. sp.
Datta and Das 1996
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1 individual | |||||||||
| GSI 20679 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | India | State/province: | Madhya Pradesh | County: | Shadol |
| Coordinates: | 23.9° North, 81.4° East (view map) | ||||
| Paleocoordinates: | 42.6° South, 51.1° East | ||||
| Basis of coordinate: | stated in text | ||||
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Late/Upper Triassic |
| Stage: | Carnian | 10 m.y. bin: | Triassic 3 |
| Key time interval: | Carnian | ||
| Age range of interval: | 237.00000 - 227.00000 m.y. ago |
Stratigraphy
| Geological group: | Gondwana | Formation: | Tiki | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "lower part of the Tiki Formation" The Tiki Formation is considered a temporal equivalent of the lower Maleri Formation, and both have been correlated on the basis of vertebrate biostratigraphy with the Scaphonyx-Exaeretodon-Herrerasaurus biozone of the Ischigualasto Formation of Argentina and the Hyperodapedon Assemblage Zone of the Santa Maria Formation of Brazil (e.g. Novas et al. 2011. Earth Env. Sci. Trans. Roy. Soc. Edin. 101:333-349). The relevant part of the Ischigualasto Formation has been dated as late Carnian in age on radioisotopic data (e.g. Martinez et al. 2011. Science 331: 206-210), and the Tiki Formation is commonly considered equivalent in age. | |||||
Lithology and environment
| Primary lithology: | paleosol/pedogenic,red calcareous claystone |
| Includes fossils? | Y |
| Lithology description: "calcareous, red mudstone unit"; specimen is shown in section as coming from a bed of "Red clay with caliche profiles". Formation includes "red mudstone with greenish grey mottling, calcareous sandstone, cross-bedded feldspathic sandstone and a lime-pellet conglomerate horizon." | |
| Environment: | fluvial indet. |
Taphonomy
| Modes of preservation: | body,replaced with calcite,replaced with hematite |
| Size of fossils: | macrofossils,mesofossils |
| Preservation of anatomical detail: | good |
| Disassociated major elements: | some |
Collection methods and comments
| Collection excludes: | some genera |
| Collection methods: | bulk,selective quarrying,sieve,field collection |
| Rock censused: | 5000 kg |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: "excavation of about 5 metric tons of rock material from a depth of approximately 1.5 m after removing surface material"; sediments then screenwashed | |
| Taxonomic list comments:The holotype of Tikiquania was previously included in this collection, but has now been excluded following the arguments of Hutchinson et al. (2012) | |
Metadata
| Database number: | 68170 | ||
| Authorizer: | J. Alroy, M. Carrano | Enterer: | J. Alroy, M. Carrano |
| Modifier: | R. Butler | Research group: | vertebrate |
| Created: | 2007-01-05 15:14:18 | Last modified: | 2012-11-30 06:56:32 |
| Access level: | the public | Released: | 2007-01-05 15:14:18 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 34164. | ETE | P. M. Datta and D. P. Das. 1996. Discovery of the oldest fossil mammal from India. Indian Minerals 50(3):217-222 [M. Carrano/M. Carrano] |
Secondary references:
| 19595 | P. M. Datta and S. Ray. 2006. Earliest lizard from the Late Triassic (Carnian) of India. Journal of Vertebrate Paleontology 26(4):795-800 [J. Alroy/J. Alroy] | |
| 43707 | M. N. Hutchinson, A. Skinner, and M. S. Y. Lee. 2012. Tikiguania and the antiquity of squamate reptiles (lizards and snakes). Biology Letters 8:665-669 [R. Butler/R. Butler] |