Unit 1, upper shale member, Mahantango Fm., Dromgold, PA (Devonian of the United States)

Where: Pennsylvania (40.3° N, 77.2° W: paleocoordinates 39.2° S, 25.5° W)

When: upper shale Member (Mahantango Formation), Givetian (387.7 - 382.7 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; gray, green, argillaceous, silty shale and siltstone

• shale, silty, micaceous, light greenish-gray; siltstone, argillaceous, medium-gray

Collection methods: surface (in situ)

Primary reference: 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]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 9704: authorized by Arnold Miller, entered by Karen Layou on 14.01.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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)
Show authors, comments, and common names
Gastropoda
 Bellerophontida - Bucanellidae
Crenistriella crenistria
Crenistriella crenistria Hall 1876 snail
common
Bivalvia
 Ostreida - Pterineidae
Actinopteria sp., Cornellites flabella
Actinopteria sp. Hall 1884 oyster
present
Cornellites flabella oyster
present
 Modiomorphida - Modiomorphidae
Modiomorpha concentrica
Modiomorpha concentrica Conrad 1838 clam
present
Rhynchonellata
 Spiriferida - Spinocyrtiidae
Mediospirifer ? audaculus
Mediospirifer ? audaculus Conrad 1842
present
 Spiriferida - Adolfiidae
"Spirifer tullius" = Allanella tullius
"Spirifer tullius" = Allanella tullius Hall 1867
abundant
 Spiriferida - Mucrospiriferidae
Mucrospirifer mucronatus, Tylothyris pauliformis
Mucrospirifer mucronatus Conrad 1841
present
  - Tropidoleptidae
Tropidoleptus carinatus
Tropidoleptus carinatus Conrad 1839
abundant
 Orthida - Rhipidomellidae
Rhipidomella leucosia, Rhipidomella vanuxemi
Rhipidomella vanuxemi Hall 1857
common
 Rhynchonellida - Camarotoechiidae
Camarotoechia sp.
Camarotoechia sp. Hall and Clarke 1893
common
Strophomenata
 Strophomenida - Leptostrophiidae
Protoleptostrophia perplana
Protoleptostrophia perplana Conrad 1839
abundant
 Strophomenida - Chonetidae
Devonochonetes coronatus
Devonochonetes coronatus Hall 1857
present
 Strophomenida - Anopliidae
"Chonetes lepidus" = Klocinetes lepidus
"Chonetes lepidus" = Klocinetes lepidus Hall 1857
present
Stenolaemata
 Cystoporida - Sulcoreteporidae
Sulcoretepora incisurata
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
abundant