St. Joseph's Island [Gull River Fm] (Ordovician of Canada)

Where: Ontario, Canada (46.2° N, 83.9° W: paleocoordinates 21.5° S, 56.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Gull River Formation, Franklinian (460.9 - 449.5 Ma)

• STRATIGRAPHIC RELATIONS: From the Gull River Fm, which locally overlies the Munising Fm (Cambrian) and is overlain by the Collingwood Fm (Late Ordovician). AGE: Middle Mohawkian or Early Franklinian; Caradocian; on the basis of conodont faunas. STRATIGRAPHIC POSITION: From throughout a 7.7m thick section.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified limestone and shale

• SPECIFIC LITHOLOGY: Limestone with minor interbedded shales. LITHIFICATION: Lithified, on the basis of sample preparation.

Size class: macrofossils

Collected by Darby

Collection methods: bulk, chemical, sieve,

• COLLECTOR: D. G. Darby. REPOSITORY: Lapworth Museum of Geology, School of Geography, Earth & Environmental Sciences, University of Birmingham.

Primary reference: I. J. Sansom and D. K. Elliott. 2002. A thelodont from the Ordovician of Canada. Journal of Vertebrate Paleontology 22(4):867-870 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90381: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to characteristic marine vertebrates and biostratigraphically useful taxa. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications.
Conodonta
 Protopanderodontida - Drepanoistodontidae
Drepanoistodus suberectus Branson and Mehl 1933 conodont
  - Coleodontidae
 Prioniodontida -
 Panderodontida - Panderodontidae
Belodina compressa Branson and Mehl 1933 conodont
 Thelodontida - Coelolepidae
Larolepis darbyi n. sp. Sansom and Elliott 2002
Pteraspidomorpha
 Astrapidiformes - Astraspididae
Astraspis desiderata Walcott 1892
 Astraspidiformes -
Eriptychius sp. Walcott 1892