unit 2, Montebello Member, Mahantango Fm., Falling Springs, PA (Devonian of the United States)

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

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

• group of beds-level stratigraphic resolution

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

• shale, silty, micaceous, grayish-olive; siltstone, micaceous, grayish olive, crossbedded and undulosely bedded, in 1-10 inch beds, forms 40% 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 9707: 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)
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
columnals; common
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
"Camarotoechia congregata" = Cupularostrum congregata
"Camarotoechia congregata" = Cupularostrum congregata Conrad 1841
abundant
 Rhynchonellida - Camarotoechiidae
Camarotoechia prolifica Hall 1867
common
 Spiriferida - Cyrtinopsidae
"Delthyris sculptilis" = Megakozlowskiella sculptilis
"Delthyris sculptilis" = Megakozlowskiella sculptilis Hall 1843
common
 Spiriferida - Mucrospiriferidae
Mucrospirifer ? mucronatus Conrad 1841
common
 Spiriferida - Spinocyrtiidae
Mediospirifer audaculus Conrad 1842
common
Strophomenata
 Strophomenida - Chonetidae
Devonochonetes coronatus Hall 1857
very abundant
Lophophorata
 Tentaculitida - Tentaculitidae
Trilobita
 Phacopida - Homalonotidae
Trimerus (Dipleura) dekayi Green 1832 trilobite
common