Unit 12, Montebello 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: Montebello Member (Mahantango Formation), Givetian (387.7 - 382.7 Ma)

• group of beds-level stratigraphic resolution

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

• 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

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 9926: 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)
Strophomenata
 Strophomenida - Chonetidae
Devonochonetes syrtalis, Devonochonetes coronatus
Devonochonetes coronatus Hall 1857
very abundant
Rhynchonellata
  - Tropidoleptidae
Tropidoleptus carinatus
Tropidoleptus carinatus Conrad 1839
very abundant
 Spiriferida - Spinocyrtiidae
Mediospirifer audaculus
Mediospirifer audaculus Conrad 1842
prsent
 Rhynchonellida - Trigonirhynchiidae
"Camarotoechia congregata" = Cupularostrum congregata
"Camarotoechia congregata" = Cupularostrum congregata Conrad 1841
abundant
Trilobita
 Phacopida - Homalonotidae
Trimerus (Dipleura) dekayi
Trimerus (Dipleura) dekayi Green 1832 trilobite
abundant