Unit 6, upper shale member, Mahantango Fm., Amity Hall, PA (Devonian of the United States)

Where: Pennsylvania (40.4° N, 77.0° W: paleocoordinates 39.2° S, 25.4° W)

• small collection-level geographic resolution

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

• group of beds-level stratigraphic resolution

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

• 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

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 9924: authorized by Arnold Miller, entered by Karen Layou on 01.02.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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)
Show authors, comments, and common names
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
abundant (columnals)
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites attenuatus
Strophomenata
 Strophomenida - Chonetidae
Devonochonetes syrtalis
 Orthotetida - Schuchertellidae
Schuchertella variabilis
Rhynchonellata
  - Tropidoleptidae
Tropidoleptus carinatus
Tropidoleptus carinatus Conrad 1839
abundant
 Spiriferida - Cyrtinopsidae
"Delthyris sculptilis" = Megakozlowskiella sculptilis
"Delthyris sculptilis" = Megakozlowskiella sculptilis Hall 1843
present
 Rhynchonellida - Trigonirhynchiidae
"Camarotoechia congregata" = Cupularostrum congregata
"Camarotoechia congregata" = Cupularostrum congregata Conrad 1841
abundant
Craniata
 Craniopsida - Craniopsidae
Craniops hamiltoniae
Craniops hamiltoniae Hall 1867
present
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
abundant
Stenolaemata
 Cystoporida - Sulcoreteporidae
Sulcoretepora cf. incisurata
Trilobita
 Phacopida - Homalonotidae
Trimerus (Dipleura) dekayi
Trimerus (Dipleura) dekayi Green 1832 trilobite
common
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
common
Ostracoda
 Palaeocopida - Beyrichiidae
Hibbardia ? lacrimosa
Hibbardia ? lacrimosa Kesling 1953 ostracod
present