GSC C12272, Baillie-Hamilton Island (Silurian of Canada)

Where: Nunavut, Canada (75.8° N, 94.5° W: paleocoordinates 3.5° N, 32.7° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Monograptus riccartonensis zone, Cape Phillips Formation, Sheinwoodian (433.4 - 430.5 Ma)

• Rohr et al.: "All of the localities are from the Monograptus riccartonensis Graptolite Zone within the Cape Phillips Formation..."

•Zhang: According to author, material is from between the murchisoni and lundgreni zones. This would make it Sheinwoodian, although author simply refers to it as Wenlockian.

• bed-level stratigraphic resolution

Environment/lithology: slope; shelly/skeletal limestone and calcareous shale

• Rohr et al.: "The nature of the faunas...is consistent with their having been derived by downslope transport and extensive disarticulation from the outer BA 3 region through BA 5."

•SEP environmental call based on given info and regional context.

•Zhang: "...Formation...represents the slope-to-basinal facies equivalent of coeval platform carbonates that occur to S and E..."

•SEP environmental call based on given info and regional context

• Rohr et al.: "alternating fine-grained argillaceous limestones and lesser amounts of interbedded calcareous shale and biogenic limestone...The shelly fossils from the lower Wenlockian beds...occur in thin shelly limestones interlayered with graptolitic shales and mudstones."

•Zhang: "..Formation consists of shale and thin bedded, laminated siltstone and limestone...Section [with faunas] broadly divisible into two lithofacies: a lower part about 25 m thick, consists mainly of medium grey, thin bedded argillaceous Lst that is variably dolomitic...and an upper part, about 65 m thick, consisting mainly of very dark grey, very thin bedded argillaceous Lst that is markedly bituminous and commonly planar laminated...These beds appear to represent sediment gravity flows that were derived from platform carbonates...some 10 km to the east. The brachiopods and conodonts were obtained from the bioclastic beds and are therefore presumed to be allochthonous."

Preservation: replaced with silica

Reposited in the GSC

Collection methods: bulk, hydrochloric

• Combined localities GSC C12272, C22184, C22187, and Perry localities BH-1-348,358,362,368,520, and 540.

•Wagner broke this up into individual localities.

Primary reference: D. M. Rohr, A.J. Boucot, and D.G. Perry. 1981. Silurian (Wenlockian) gastropods from Baillie-Hamilton Island, Canadian Arctic. Journal of Paleontology 55(2):331-339 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 26009: authorized by Michael Foote, entered by Michael Foote on 30.09.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• List in Part I of monograph (PBDB ref. 7205) covers all the brachiopods, whereas the systematic treatment is spread out through three parts (refs. 7205-7207). Trilobites given in Perry & Chatterton 1977.
unclassified
  -
Ostracoda
 Palaeocopida -
Severella arctosulcata3 Zhang 1989 ostracod
Strophomenata
 Orthotetida - Triplesiidae
 Orthotetida - Chilidiopsidae
 Strophomenida - Sowerbyellidae
"Paranisopleurella cooperi" = Eoplectodonta (Ygerodiscus)3
"Paranisopleurella cooperi" = Eoplectodonta (Ygerodiscus)3
 Strophomenida - Aegiromenidae
"Aegiria grayi" = Jonesea grayi3, ? Chonetoidea cocksi3
"Aegiria grayi" = Jonesea grayi3 Davidson 1849
 Strophomenida - Leptestiidae
"Opikella sp." = Leangella3
"Opikella sp." = Leangella3 Opik 1933
 Strophomenida - Leptaenoideidae
Liljevallia amorpha3 Zhang 1989
 Strophomenida - Rafinesquinidae
Leptaena "Form 2"3 Dalman 1828
 Strophomenida - Amphistrophiidae
Amphistrophia sp.3 Hall and Clarke 1892
 Strophomenida - Strophomenidae
 Strophomenida - Eopholidostrophiidae
Rhynchonellata
 Athyridida - Meristidae
Merista sp.3 Suess 1851
 Athyridida - Nucleospiridae
 Athyridida - Athyrididae
 Spiriferida - Adolfiidae
 Spiriferida - Cyrtiidae
Cyrtia alatiformis3 Zhang 1989
Hedeina sp.3 Boucot 1957
Janius occidentalis3 Boucot et al. 1988
 Spiriferida - Ambocoeliidae
 Spiriferida - Delthyrididae
Howellella sp.3 Kozlowski 1946
 Spiriferida - Reticulariidae
Spirinella struszi3 Zhang 1989
 Pentamerida - Parastrophinidae
"Grayina cf. magnifica" = Anastrophia (Grayina)3
"Grayina cf. magnifica" = Anastrophia (Grayina)3
 Pentamerida - Gypidulidae
 Pentamerida - Clorindidae
 Pentamerida - Subrianidae
 Pentamerida - Pentameridae
? Lissocoelina sp.3 Schuchert and Cooper 1931
? Rhipidium sp.3 Schuchert and Cooper 1931
 Protorthida - Skenidiidae
Skenidioides operosa3 Johnson et al. 1976
 Atrypida - Atrypidae
"? Eospinatrypa savagei" = Plectatrypa savagei3 Zhang 1989
 Atrypida - Atrypinidae
 Atrypida - Lissatrypidae
Lissatrypa cf. atheroidea3 Twenhofel 1914
 Atrypida - Punctatrypidae
 Atrypida - Glassiidae
? Glassia "sp. 2"3 Davidson 1881
? Glassia "sp. 1"3 Davidson 1881
 Atrypida - Anazygidae
 Rhynchonellida - Trigonirhynchiidae
 Rhynchonellida - Rhynchotrematidae
 Orthida - Draboviidae
? Drabovia sp.3 Havlicek 1950
Hirnantia sp.1 Lamont 1935
 Orthida - Rhipidomellidae
 Orthida - Dicoelosiidae
 Orthida - Dalmanellidae
 Orthida - Hesperorthidae
Flabellitesia kessei3 Boucot et al. 1988
 Orthida - Wangyuiidae
Craniata
 Trimerellida - Trimerellidae
Trimerella sp.3 Billings 1862
Gastropoda
 Cyrtoneritimorpha - Orthonychiidae
"Platyceras (Orthonychia) baldwini" = Orthonychia baldwini
"Platyceras (Orthonychia) baldwini" = Orthonychia baldwini Rohr et al. 1981 snail
 Trochonematoidea - Trochonematidae
"Trochonema (Eunema) kaysi" = Globonema kaysi
"Trochonema (Eunema) kaysi" = Globonema kaysi Rohr et al. 1981 snail
 Euomphalina - Euomphalidae
Poleumita sp. Clarke and Ruedemann 1903 snail
 Euomphalina - Anomphalidae
Pycnomphalus cf. obesus Lindström 1884 snail
 Euomphalina - Platyceratidae
"Platyceras (Platyostoma) boggsi" = Platyostoma boggsi
"Platyceras (Platyostoma) boggsi" = Platyostoma boggsi Rohr et al. 1981 snail
BH-1-348 (8); BH-1-358 (22); BH-1-362 (20); BH-1-368 (6); BH-1-540 (2);
 Euomphalina - Oriostomatidae
"? Oriostoma clarki" = Hecetastoma clarki, ? Oriostoma sp.2
"? Oriostoma clarki" = Hecetastoma clarki Rohr et al. 1981 snail
? Oriostoma sp.2 Munier-Chalmas 1876 snail
BH-1-540 (5);
 Murchisoniina - Murchisoniidae
Murchisonia aff. obtusangula2 Lindström 1884 snail
BH-1-358 (22); BH-1-540 (43);