Unit 8, Montebello Member, Mahantango Fm., Rockville, Perry Co., PA (Devonian of the United States)

Where: Perry County, Pennsylvania (40.3° N, 77.1° W: paleocoordinates 39.3° S, 25.5° W)

• coordinate based on political unit

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

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; gray, argillaceous, calcareous siltstone and sandstone

• siltstone, argillaceous, olive gray, in 6-12 inch beds; sandstone, calcareous, medium greenish gray, forms 10% of the unit, somewhat punky, fossiliferous zone at the base of the unit

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 9660: 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)
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Bivalvia
 Ostreida - Pterineidae
Cornellites flabella
Cornellites flabella oyster
present
Rhynchonellata
 Spiriferida - Spinocyrtiidae
Spinocyrtia granulosa, Mediospirifer ? dromgoldi
Spinocyrtia granulosa Conrad 1839
present
 Orthida - Rhipidomellidae
Rhipidomella ? penelope
Strophomenata
 Strophomenida - Chonetidae
Devonochonetes coronatus
Devonochonetes coronatus Hall 1857
present
Anthozoa
 Favositida - Favositidae
Favosites sp.
Favosites sp. Lamarck 1816 tabulate coral
abundant