Quillon [Quilon Limestone]: Early/Lower Miocene, India
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Cerithiidae
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Ptychocerithium rude
(Sowerby 1840)
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| recombined as Cerithium (Ptychocerithium) rude | |||||||
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Gastropoda
- Neogastropoda
- Conidae
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Conus (Leptoconus) marginatus
(Sowerby 1839)
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Gastropoda
- Cassidae
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Phalium (Semicassis) sculptum
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| original and current combination Semicassis | |||||||
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Gastropoda
- Ranellidae
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Argobuccinum (Biplex) perca
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| original and current combination Biplex | |||||||
| see common names | |||||||
Geography
| Country: | India |
| Coordinates: | 9.3° North, 76.5° East (view map) |
| Paleocoordinates: | 2.2° North, 72.6° East |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Early/Lower Miocene | ||
| Age range of interval: | 23.03000 - 15.98000 m.y. ago |
Stratigraphy
| Formation: | Quilon Limestone | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Quilon Limestone, which overlie unconformably Archean granites, and are regionally overlain by the Late Miocene Wakalay beds. THICKNESS: From 1-1.25 ft thick limestone within section of about 40 ft thick. AGE: Early MIocene based on multiple sources, including ostracod biostratigraphy (Khosla and Nagori, 1989) and vertebrate (Sahni and Mitra, 1980). STRATIGRAPHIC POSITION: From entire formation, which is found at the base of this section. | |||||
Lithology and environment
| Primary lithology: | gray,yellow,blue poorly lithified "limestone" |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Limestone, impure, argillaceous, highly indurated, dull yellowish to bluish grey. The upper and lower parts are less compact and present less difficulty in extraction of fossils. LITHIFICATION: Ranging from lithified to poorly lithified. | |
| Environment: | carbonate indet. |
| Geology comments: ENVIRONMENT: Carbonate facies. Environment not discussed in text (at least that is available at present), but appears to be relatively shallow water. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Collection methods: | surface (in situ),survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTOR: Unknown. REPOSITORY: Presumably BMNH. | |
| Taxonomic list comments:COVERAGE: Limited to representative forms of gastropoda and bivalvia. NOMENCLATURE: Not an authoritative publication and somewhat antiquated, though nevertheless, consistent use of subgenera and species-resolution assignments permit nomenclatural vetting. | |
Metadata
| Also known as: | (58 D/9, B.2) | ||
| Database number: | 77656 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2008-01-16 10:33:30 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | authorizer only | Released: | 2009-01-16 10:33:30 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 26237. | F. E. Eames. 1950. On the ages of certain Upper Tertiary beds of Peninsula India and Ceylon. Geological Magazine 87:233-252 [A. Hendy/A. Hendy] |