Unit 3, Montebello Member, Mahantango Fm., Rockville, Perry Co., PA (Devonian of the United States)

Where: Perry County, Pennsylvania (40.3° N, 76.9° W: paleocoordinates 39.3° S, 25.3° W)

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

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; concretionary, gray, sandy, calcareous shale

• shale, sandy, micaceous, very slightly calcareous, medium gray; one-inch concretions of siltstone present

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 9659: authorized by Arnold Miller, entered by Karen Layou on 10.01.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Relative abundance information: present (one specimen collected), common (2-10 specimens collected), abundant (more than 10 specimens collected), very abundant (sample extremely rich in a given species)
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
abundant
Trilobita
 Phacopida - Acastidae
Greenops boothi Green 1837 trilobite
present
 Phacopida - Phacopidae
"Phacops rana" = Eldredgeops rana
"Phacops rana" = Eldredgeops rana Green 1832 trilobite
present
Polychaeta
  -
Polychaeta indet. Grube 1850
common
Cephalopoda
 Pseudorthocerida - Spyroceratidae
Gastropoda
 Euomphalina - Platyceratidae
Bivalvia
 Pectinida - Pterinopectinidae
Pterinopecten princeps scallop
common
 Ostreida - Pterineidae
Cornellites flabella oyster
abundant
Actinopteria decussata oyster
present
Actinopteria boydi Conrad 1842 oyster
common
 Modiomorphida - Cypricardiniidae
Cypricardinia indenta Conrad 1842 clam
present
 Modiomorphida - Modiomorphidae
Modiomorpha concentrica Conrad 1838 clam
present
 Nuculanida - Malletiidae
Palaeoneilo muta clam
present [entered as Paleoneilo muta]
Palaeoneilo tenuistriata clam
present [entered as Paleoneilo tenuistriata]
Strophomenata
 Productida - Productellidae
"Productella spinulicosta" = Spinulicosta spinulicosta
"Productella spinulicosta" = Spinulicosta spinulicosta Hall 1857
abundant
 Strophomenida - Chonetidae
Devonochonetes coronatus Hall 1857
present
 Strophomenida - Douvillinidae
 Strophomenida - Leptostrophiidae
Protoleptostrophia perplana Conrad 1839
present
 Strophomenida - Strophodontidae
 Orthotetida - Schuchertellidae
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
"Camarotoechia congregata" = Cupularostrum congregata
"Camarotoechia congregata" = Cupularostrum congregata Conrad 1841
abundant
 Orthida - Rhipidomellidae
Rhipidomella vanuxemi Hall 1857
common
 Athyridida - Athyrididae
Athyris spiriferoides Eaton 1831
abundant
 Spiriferida - Spinocyrtiidae
Mediospirifer audaculus Conrad 1842
abundant
Spinocyrtia granulosa Conrad 1839
present
 Spiriferida - Ambocoeliidae
Ambocoelia ? umbonata Conrad 1842
present
 Terebratulida - Centronellidae
Centronella sp. Billings 1859
present
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
present
Stenolaemata
 Cryptostomata - Fenestellidae
Fenestella sp. Lonsdale 1839
present
Taonurus
  -
Taonurus sp. Fischer-Ooster 1858
common