Unit 7, 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, green, silty, calcareous shale and siltstone

• shale, silty, olive gray to dark greenish gray, one to four inch beds of siltstone, calcareous, medium gray from 15% of the upper half of the 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 9925: 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
Strophomenata
 Strophomenida - Leptostrophiidae
Protoleptostrophia perplana
Protoleptostrophia perplana Conrad 1839
present
 Strophomenida - Chonetidae
Devonochonetes scitulus, Longispina mucronatus
Devonochonetes scitulus Hall 1857
abundant
Rhynchonellata
 Spiriferida - Mucrospiriferidae
Mucrospirifer mucronatus
Mucrospirifer mucronatus Conrad 1841
very abundant
Cephalopoda
 Dissidocerida - Geisonoceratidae
Striacoceras ? typum
Gastropoda
 Murchisoniina - Eotomariidae
Bembexia laevis
Bembexia laevis Ellison 1965 snail
common
 Murchisoniina - Palaeozygopleuridae
"Loxonema delphicola" = Palaeozygopleura delphicola
"Loxonema delphicola" = Palaeozygopleura delphicola Hall 1860 snail
present
Bivalvia
 Nuculanida - Malletiidae
Palaeoneilo constricta
Palaeoneilo constricta Conrad 1842 clam
common [entered as Paleoneilo constricta]
 Carditida - Eodonidae
"Cypricardella bellastriata" = Eodon bellastriatus
"Cypricardella bellastriata" = Eodon bellastriatus Conrad 1842 clam
common
 Lucinida - Mactromyidae
Paracyclas lirata
Paracyclas lirata clam
abundant