S2/f524 - Anthill Black Shale, Aorangi Mine: Bendigonian, New Zealand
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Pterobranchia
- Graptoloidea
- Sigmagraptidae
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Goniograptus cf. thureaui
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C category | ||||||
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Pterobranchia
- Graptoloidea
- Dichograptidae
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Didymograptus sp.
McCoy 1851
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C category | ||||||
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Didymograptus cf. asperus
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"Didymograptus" cf. missilis
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Clonograptus sp.
Nicholson 1873
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R category | ||||||
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Clonograptus cf. rigidus
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Pterobranchia
- Graptoloidea
- Phyllograptidae
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Tetragraptus decipens
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R category | ||||||
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Tetragraptus cf. amii
Elles and Wood 1902
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R category | ||||||
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Tetragraptus fruticosus
(Hall 1858)
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C category | ||||||
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Phyllograptus cf. anna
Hall 1865
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C category | ||||||
| see common names | |||||||
Geography
| Country: | New Zealand |
| Coordinates: | 40.6° South, 172.6° East (view map) |
| Paleocoordinates: | 13.3° North, 163.6° West |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Early Ordovician |
| Stage: | Floian | 10 m.y. bin: | Ordovician 2 |
| Key time interval: | Bendigonian | ||
| Age range of interval: | 473.5 - 471.8 m.y. ago |
Stratigraphy
| Formation: | Aorangi Mine | Member: | Anthill Black Shale | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: Derived from Anthill Black Shale Member of Aorangi Mine Fm, which overlies the Malone Mbr (lower and middle Lancefieldian) and is overlain by the Battery Mb (upper Castlemainian and lower Yapeenian). THICKNESS: 150 m in type section. AGE: Zone of T. fruticosus, corresponding to the middle part of the member and is Bendigonian. STRATIGRAPHIC POSITION: Presumably middle part of Anthill Black Shale Mbr. | |||||
Lithology and environment
| Primary lithology: | pyritic,black lithified cherty/siliceous "shale" |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Extremely hard, siliceous, pyritic black shale and chert. LITHIFICATION: Lithified, as text states lithology to be "extremely hard". | |
| Environment: | basinal (siliciclastic) |
| Geology comments: ENVIRONMENT: Quiet bottom water, lack of circulation, plankton-rich, extreme paucity of incoming clastic detritus, slow persistent supply of biogenic silica. Environment of deposition presumed to be that of a starved offshore basin within or adjacent to a region of normal clastic deposition. Water depth likely to have been with the range of the bathyal depth zone. | |
Taphonomy
| Modes of preservation: | original carbon |
| Size of fossils: | macrofossils |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | bulk,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | IGNS |
| Collection method comments: COLLECTOR: S.K. Swarko (1959), see Swarko (1961), p. 101-2. REPOSITORY: New Zealand Geological Survey (now GNS Science), Lower Hutt, New Zealand | |
| Taxonomic list comments:COMPLETENESS: Only graptolite taxa listed, however no other faunas mentioned in text, except rare phyllocarid crustaceans. IDENTIFICATIONS: Older collections re-examined by R.A. Cooper, otherwise lists collected and identified by R.A. Cooper. | |
Metadata
| Also known as: | GS 7483 | ||
| Database number: | 63191 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-08-09 01:43:10 | Last modified: | 2017-05-23 16:34:15 |
| Access level: | the public | Released: | 2006-08-09 01:43:10 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 18179. | R. A. Cooper. 1979. Ordovician Geology and Graptolite faunas of the Aorangi Mine area, North-west Nelson, New Zealand. New Zealand Geological Survey Paleontological Bulletin 47 [A. Miller/A. Hendy] |