GSC C-22184, Baillie-Hamilton Is. (Silurian of Canada)

Also known as Trilobite-Ostracode Fauna, Cape Phillips Fm/; Brachiopods, Cape Phillips Formation,

Where: Nunavut, Canada (75.8° N, 94.5° W: paleocoordinates 3.5° N, 32.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• Parts of section yielding trilobites are from about 97.5 ft. to 245 ft. above base, spanning early Wenlockian Cyrtograptus canadenses through penultimate Wenlockian Monograptus testis zones. Monograptus riccartonensis-Monograptus firmus

•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

• SEP environmental call based on given info and regional context
• "alternating fine grained, argillaceous limestones and lesser amounts of interbedded calcareous shale and biogenic limestone" Column shows the last two named lithologies to be most relevant to these collections.

•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."

Size class: macrofossils

Preservation: replaced with silica

Reposited in the GSC

Collection methods: bulk, hydrochloric

Primary reference: D. G. Perry and B. D. E. Chatterton. 1977. Silurian (Wenlockian) trilobites from Baillie-Hamilton Island, Canadian Arctic Archipelago. Canadian Journal of Earth Sciences 14:285-317 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 26003: authorized by Michael Foote, entered by Michael Foote on 30.09.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Presented in multiple papers.

•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).

 Corynexochida - Illaenidae
Illaenidae indet. Hawle and Corda 1847 trilobite
 Odontopleurida - Odontopleuridae
Acidaspis sp. Murchison 1839 trilobite
 Phacopida - Encrinuridae
Encrinurus (Fragiscutum) sp. Emmrich 1844 trilobite
 Phacopida - Cheiruridae
Parayoungia mclaughlini n. sp.1 Adrain 1998 trilobite
Hyrokbye youngi n. sp.1 trilobite
? Deiphon sp. Barrande 1846 trilobite
Sphaerexochus dimorphus n. sp. Whittington and Evitt 1953 trilobite
 Phacopida - Calymenidae
Calymene sp. Brongniart 1822 trilobite
 Proetida - Proetidae
sensu lato Proetus sp. Steininger 1831 trilobite
 Lichida - Lichidae
Lichidae "n. gen. n. sp." Hawle and Corda 1847 trilobite
Lichid n. gen. n. sp.
Lichidae "indet. 2" Hawle and Corda 1847 trilobite
Indeterminate lichid sp. 2
Borealarges mikulicorum2 Perry and Chatterton 1977 trilobite
Dicranogmus skinneri n. sp. Perry and Chatterton 1977 trilobite
 Palaeocopida -
Severella arctosulcata6 Zhang 1989 ostracod
 Leperditicopida - Leperditiidae
 Orthotetida - Triplesiidae
 Orthotetida - Chilidiopsidae
 Strophomenida - Sowerbyellidae
"Paranisopleurella cooperi" = Eoplectodonta (Ygerodiscus)6
"Paranisopleurella cooperi" = Eoplectodonta (Ygerodiscus)6
 Strophomenida - Aegiromenidae
"Aegiria grayi" = Jonesea grayi6, ? Chonetoidea cocksi6
"Aegiria grayi" = Jonesea grayi6 Davidson 1849
 Strophomenida - Leptaenoideidae
Liljevallia amorpha6 Zhang 1989
 Strophomenida - Rafinesquinidae
Leptaena "Form 1"6 Dalman 1828
Leptaena "Form 2"6 Dalman 1828
 Strophomenida - Strophodontidae
 Strophomenida - Amphistrophiidae
Amphistrophia sp.6 Hall and Clarke 1892
 Strophomenida - Strophomenidae
 Strophomenida - Eopholidostrophiidae
 Athyridida - Meristidae
Merista sp.6 Suess 1851
 Athyridida - Nucleospiridae
 Athyridida - Athyrididae
 Spiriferida - Adolfiidae
 Spiriferida - Cyrtiidae
Cyrtia alatiformis6 Zhang 1989
Hedeina sp.6 Boucot 1957
Janius occidentalis6 Boucot et al. 1988
 Spiriferida - Ambocoeliidae
 Spiriferida - Delthyrididae
Howellella sp.6 Kozlowski 1946
 Spiriferida - Reticulariidae
Spirinella struszi6 Zhang 1989
 Pentamerida - Parastrophinidae
"Grayina cf. magnifica" = Anastrophia (Grayina)6
"Grayina cf. magnifica" = Anastrophia (Grayina)6
 Pentamerida - Gypidulidae
 Pentamerida - Clorindidae
Clorinda sp.6 Barrande 1879
? Clorinda sp.6 Barrande 1879
Antirhynchonella sp.6 Oehlert 1887
 Pentamerida - Subrianidae
 Pentamerida - Pentameridae
? Rhipidium sp.6 Schuchert and Cooper 1931
 Protorthida - Skenidiidae
Skenidioides operosa6 Johnson et al. 1976
 Atrypida - Atrypidae
 Atrypida - Atrypinidae
 Atrypida - Lissatrypidae
Lissatrypa cf. atheroidea6 Twenhofel 1914
 Atrypida - Punctatrypidae
 Atrypida - Glassiidae
? Glassia "sp. 1"6 Davidson 1881
 Atrypida - Anazygidae
 Rhynchonellida - Trigonirhynchiidae
 Rhynchonellida - Rhynchotrematidae
 Orthida - Draboviidae
 Orthida - Rhipidomellidae
 Orthida - Dicoelosiidae
 Orthida - Dalmanellidae
 Orthida - Hesperorthidae
Flabellitesia kessei6 Boucot et al. 1988
 Orthida - Wangyuiidae
 Trimerellida - Trimerellidae
Trimerella sp.6 Billings 1862
 Trochonematoidea - Trochonematidae
"Trochonema (Eunema) kaysi" = Globonema kaysi3
"Trochonema (Eunema) kaysi" = Globonema kaysi3 Rohr et al. 1981 snail
 Euomphalina - Euomphalidae
Poleumita sp.3 Clarke and Ruedemann 1903 snail
 Euomphalina - Platyceratidae
Platyceras (Platyceras) sp.3 Conrad 1840 snail
"Platyceras (Platyostoma) boggsi" = Platyostoma boggsi3 Rohr et al. 1981 snail
 Murchisoniina - Murchisoniidae
Murchisonia aff. obtusangula5 Lindström 1884 snail
 Murchisoniina - Hormotomidae
Diplozone aff. innocens5 Perner 1907 snail