Unit 12, Montebello Member, Mahantango Fm., Amity Hall, PA: Givetian, Pennsylvania
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata
- Strophomenida
- Chonetidae
|
||||||||||
Devonochonetes syrtalis
|
||||||||||
very abundant | ||||||||||
Devonochonetes coronatus
(Hall 1857)
|
||||||||||
very abundant | ||||||||||
Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
|
||||||||||
Camarotoechia congregata
(Conrad 1841)
|
||||||||||
recombined as Cupularostrum congregata | ||||||||||
abundant | ||||||||||
Rhynchonellata
- Tropidoleptidae
|
||||||||||
Tropidoleptus carinatus
(Conrad 1839)
|
||||||||||
very abundant | ||||||||||
Rhynchonellata
- Spiriferida
- Spinocyrtiidae
|
||||||||||
Mediospirifer audaculus
(Conrad 1842)
|
||||||||||
prsent | ||||||||||
Trilobita
- Phacopida
- Homalonotidae
|
||||||||||
Trimerus (Dipleura) dekayi
Green 1832
|
||||||||||
abundant | ||||||||||
Crinoidea
|
||||||||||
Crinoidea indet.
Miller 1821
|
||||||||||
abundant (columnals) | ||||||||||
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: | Montebello |
Local section: | Amity Hall | Local bed: | unit 12 | ||
Local order: | top to bottom | ||||
Stratigraphic resolution: | group of beds |
Lithology and environment
Primary lithology: | "cross stratification",gray sandy siltstone | ||
Secondary lithology: | "shale" | ||
Includes fossils? | Y | ||
Includes fossils? | Y | ||
Lithology description: interbedded shale and siltstone, siltstone and very fine grained sandstone, dark greenish gray, in cross beds and lenticular beds commonly 2-4 inches, but up to 2 ft. thick, shale, snady micaceous, forms less than 10% of lower half of unit, 80% of upper half | |||
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: | 9926 | ||
Authorizer: | A. Miller | Enterer: | K. Layou | Research group: | marine invertebrate |
Created: | 2001-02-01 07:40:14 | 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] |