Unit 6, upper shale member, Mahantango Fm., Amity Hall, PA: Givetian, Pennsylvania
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Crinoidea
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Crinoidea indet.
Miller 1821
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| abundant (columnals) | ||||||||||
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Ostracoda
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Ostracoda indet.
Latreille 1802
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| common | ||||||||||
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Ostracoda
- Palaeocopida
- Beyrichiidae
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Hibbardia ? lacrimosa
Kesling 1953
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| present | ||||||||||
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Trilobita
- Phacopida
- Homalonotidae
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Trimerus (Dipleura) dekayi
Green 1832
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| common | ||||||||||
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Rhynchonellata
- Tropidoleptidae
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Tropidoleptus carinatus
(Conrad 1839)
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| abundant | ||||||||||
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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Camarotoechia congregata
(Conrad 1841)
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| recombined as Cupularostrum congregata | ||||||||||
| abundant | ||||||||||
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Rhynchonellata
- Spiriferida
- Cyrtinopsidae
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Delthyris sculptilis
Hall 1843
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| recombined as Megakozlowskiella sculptilis | ||||||||||
| present | ||||||||||
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Strophomenata
- Orthotetida
- Schuchertellidae
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Schuchertella variabilis
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| very abundant | ||||||||||
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Strophomenata
- Strophomenida
- Chonetidae
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Devonochonetes syrtalis
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| common | ||||||||||
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Craniata
- Craniopsida
- Craniopsidae
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Craniops hamiltoniae
(Hall 1867)
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| present | ||||||||||
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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| abundant | ||||||||||
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Stenolaemata
- Cystoporida
- Sulcoreteporidae
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Sulcoretepora cf. incisurata
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| abundant | ||||||||||
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Tentaculitida
- Tentaculitidae
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Tentaculites attenuatus
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| common | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Pennsylvania |
| Coordinates: | 40.4° North, 77.0° West (view map) | ||
| Paleocoordinates: | 39.2° South, 25.4° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Devonian | Epoch: | Middle Devonian |
| Stage: | Givetian | 10 m.y. bin: | Devonian 3 | *Local age/stage: | Erian |
| Key time interval: | Givetian | ||
| Age range of interval: | 387.70000 - 382.70000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Hamilton | Formation: | Mahantango | Member: | Upper shale |
| Local section: | Amity Hall | Local bed: | unit 6 | ||
| Local order: | top to bottom | ||||
| Stratigraphic resolution: | group of beds |
Lithology and environment
| Primary lithology: | planar lamination,gray argillaceous siltstone | ||
| Secondary lithology: | "shale" | ||
| Lithology description: siltstone, argillaceous, dark gray, in laminated, undulose to lenticular beds commonly 2 inches thick near base of unti and 1-3 ft. thick toward top; shale forms 40% of unit | |||
| Environment: | marine indet. | Tectonic setting: | foreland basin |
Taphonomy
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | paleoecologic analysis |
| Taxonomic list comments:Relative abundance information: present (1 specimen collected), common (2-10 specimens collected), abundant (more than 10 specimens collected), very abundant (sample extremely rich in a given species) | |
Metadata
| Database number: | 9924 | ||
| Authorizer: | A. Miller | Enterer: | K. Layou | Research group: | marine invertebrate |
| Created: | 2001-02-01 07:21:26 | Last modified: | 2001-08-30 17:52:51 |
| Access level: | the public | Released: | 2001-02-01 12:02:00 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 841. | R. L. Ellison. 1965. Stratigraphy and Paleontology of the Mahantango Formation in south-central Pennsylvania. Pennsylvania Geological Survey Bulletin G48 1-298 [A. Miller/K. Layou] |