Arisaig BC 4-5 (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: Beechhill Cove Formation, Llandovery (443.4 - 433.4 Ma)

• Underlying volcanics Rb-Sr date at earliest Llandovery- latest Ashgillian. Beechill Cove Fm. unconformably/disconformably overlies these.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, burrowed, silty sandstone

• Fine sandstones, coarse siltstones, up to 50 cm thick beds. Basal surfaces are sharp, erosive, scoured up to 25 cm deep. Considerable internal variation: graded beds of shells, parallel lamination, cross-lamination, one bed of hummocky cross-stratification.

Primary reference: R. K. Pickerill and J. M. Hurst. 1983. Sedimentary facies, depositional environments, and faunal associations of the lower Llandovery (Silurian) Beechill Cove Formation, Arisaig, Nova Scotia. Canadian Journal of Earth Sciences 20:1761-1779 [J. Alroy/M. Sommers/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 3225: authorized by John Alroy, entered by Mike Sommers on 27.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Ichnofauna: Chondrites. Megalites used as a field term for previously undescribed problematica akin to but not identical to both cornulitids and tentaculitids.
Show authors, comments, and common names
Anthozoa
 Stauriida - Streptelasmatidae
? Rhegmaphyllum sp.
? Rhegmaphyllum sp. Wedekind 1927 horn coral
originally entered as "? Rhegmophyllum sp."
Rhynchonellata
 Orthida - Hesperorthidae
Dolerorthis sp.
Dolerorthis sp. Schuchert and Cooper 1931
 Orthida - Dalmanellidae
Dalmanellidae indet.
Dalmanellidae indet. Schuchert 1913
indet. dalmanellid
 Orthida - Rhipidomellidae
Mendacella arisaigensis
 Rhynchonellida - Camarotoechiidae
Camarotoechia bimesiornata
Strophomenata
 Strophomenida - Leptostrophiidae
"Leptostrophia beechillensis" = Leptostrophia beechhillensis
"Leptostrophia beechillensis" = Leptostrophia beechhillensis McLearn 1924
Gastropoda
  -
Gastropoda indet., Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
trochiform gastropods
Gastropoda indet. Cuvier 1795 snail
indet. gastropod
 Murchisoniina - Eotomariidae
Liospira cf. affinis
Liospira cf. affinis Foerste 1887 snail
originally entered as "Liospira cf. affinis"
 Euomphalina - Platyceratidae
Naticonema kauffmani, Cyclonema parvimedium
Naticonema kauffmani Peel 1975 snail
Cyclonema parvimedium McLearn 1924 snail