Unit 1, upper shale member, Mahantango Fm., Dromgold, PA: Givetian, Pennsylvania

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida - Leptostrophiidae
Protoleptostrophia perplana (Conrad 1839)
abundant
Strophomenata - Strophomenida - Anopliidae
Chonetes lepidus (Hall 1857)
recombined as Klocinetes lepidus
present
Strophomenata - Strophomenida - Chonetidae
Devonochonetes coronatus (Hall 1857)
present
Rhynchonellata - Spiriferida - Spinocyrtiidae
Mediospirifer ? audaculus (Conrad 1842)
present
Rhynchonellata - Spiriferida - Adolfiidae
Spirifer tullius (Hall 1867)
recombined as Allanella tullius
abundant
Rhynchonellata - Spiriferida - Mucrospiriferidae
Mucrospirifer mucronatus (Conrad 1841)
present
Tylothyris pauliformis
present
Rhynchonellata - Tropidoleptidae
Tropidoleptus carinatus (Conrad 1839)
abundant
Rhynchonellata - Rhynchonellida - Camarotoechiidae
Camarotoechia sp. Hall and Clarke 1893
common
Rhynchonellata - Orthida - Rhipidomellidae
Rhipidomella leucosia
common
Rhipidomella vanuxemi (Hall 1857)
common
Stenolaemata - Cystoporida - Sulcoreteporidae
Sulcoretepora incisurata
abundant
Bivalvia - Ostreida - Pterineidae
Actinopteria sp. Hall 1884
present
Cornellites flabella
present
Bivalvia - Modiomorphida - Modiomorphidae
Modiomorpha concentrica (Conrad 1838)
present
Gastropoda - Bellerophontida - Bucanellidae
Crenistriella crenistria (Hall 1876)
common
Crinoidea
Crinoidea indet. Miller 1821
abundant
see common names

Geography
Country:United States State/province:Pennsylvania
Coordinates: 40.3° North, 77.2° West (view map)
Paleocoordinates:39.2° South, 25.5° West
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:Dromgold Local bed:1
Local order:bottom to top
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology:gray,green argillaceous,silty "shale"
Secondary lithology: siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: shale, silty, micaceous, light greenish-gray; siltstone, argillaceous, medium-gray
Environment:marine indet. Tectonic setting:foreland basin
Taphonomy
Collection methods and comments
Collection methods:surface (in situ)
Reason for describing collection:paleoecologic analysis
Taxonomic list comments:Relative abundance info: 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:9704
Authorizer:A. Miller Enterer:K. Layou
Research group:marine invertebrate
Created:2001-01-14 11:26:39 Last modified:2001-08-30 17:52:51
Access level:the public Released:2001-01-14 12:01:00
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]