Hagan 18 (HMB18) (Ordovician of the United States)

Where: Virginia (36.7° N, 83.3° W: paleocoordinates 29.0° S, 63.3° W)

• coordinate based on unpublished field data

• small collection-level geographic resolution

When: Trenton Formation, Caradoc (458.4 - 449.5 Ma)

• Total unit thickness = 59.44 m

•Time interval = Trentonian-Maysvillian

•

•Stratigraphic and geologic descriptions based on Kreisa (1980)

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, intraclastic, shelly/skeletal, gray packstone and lithified shale

• Stratigraphic and geologic descriptions based on Kreisa (1980); within Kreisa's carbonate platform facies
• Limestone (90%) and shale (10%); limestone is skeletal packstone (50%) and laminated calcisiltite, medium light gray, thin and medium bedded, with zones very thin bedded; packstones commonly with scattered intraclasts, variable in thickness laterally; calcisiltites plane laminated

Size class: macrofossils

Collection methods: bulk,

Primary reference: K. M. Layou. 2009. Ecological restructuring after extinction: the Late Ordovician (Mohawkian) of the eastern United States. Palaios 24:118-128 [K. Layou/K. Layou]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 85680: authorized by Karen Layou, entered by Karen Layou on 13.01.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite
Stenolaemata
  -
Stenolaemata "indet. A"
Stenolaemata "indet. A" Borg 1926
small ramose bryozoans
Rhynchonellata
 Orthida - Dalmanellidae
Dalmanella fertilis
Dalmanella fertilis Ulrich 1909
 Atrypida - Anazygidae
Zygospira lebanonensis
Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella rugosa
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
low-spired gastropod
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily