Arisaig 4-7 (Silurian of Canada)

Where: Nova Scotia, Canada (45.6° N, 62.0° W: paleocoordinates 38.1° S, 32.1° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: middle Member (Ross Brook Formation), Llandovery (443.4 - 433.4 Ma)

• Middle to late Llandovery.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, bioturbated, gray, silty shale

• Extremely bioturbated, greenish-gray silty mudstone of fissile shale, mixed with 0.5 - 30 cm thick layers and lenses of fine- to coarse-grained siltstone, mega-rippled upper surfaces. Water depth < 90 m.

Collection methods: surface (in situ), mechanical,

Primary reference: J. M. Hurst and R. K. Pickerill. 1986. The relationship between sedimentary facies and faunal associations in the Llandovery siliclastic Ross Brook Formation, Arisaig, Nova Scotia. Canadian Journal of Earth Science 23:705-726 [J. Alroy/M. Sommers/A. Clement]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 3040: authorized by John Alroy, entered by Mike Sommers on 23.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Ichnofossils: Chondrites, Planolites, Palaeophycus, Helminthopsis.

Faunal count: 108.

Show authors, comments, and common names
Craniata
 Craniopsida - Craniopsidae
Paracraniops sp.
Paracraniops sp. Williams 1963
Rhynchonellata
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
 Orthida - Dalmanellidae
Visbyella nana
 Rhynchonellida - Camarotoechiidae
Plagiorhyncha aff. glassi
Plagiorhyncha aff. glassi
originally entered as "Plagiorhyncha aff. glassi"
 Rhynchonellida - Leptocoeliidae
Eocoelia hemisphaerica
Strophomenata
 Strophomenida - Leptostrophiidae
Leptostrophia sp.
Leptostrophia sp. Hall and Clarke 1892
 Strophomenida - Amphistrophiidae
Amphistrophia sp.
Amphistrophia sp. Hall and Clarke 1892
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
crinoid ossicles