Gun River Formation

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Gun River Formation
Stratigraphic range: Early Silurian (Llandovery)
TypeGeological formation
Sub-units
  • Lachute Member
  • Innomée Member
  • Sandtop Member
  • Macgilvray Member
UnderliesMenier Formation[1]
OverliesMerrimack Formation[1]
Thickness85 to 100 meters[1]
Location
RegionQuebec
CountryCanada
Type section
Named bySchuchert and Twenhofel[1]
Year defined1910[1]

The Gun River Formation is a geologic formation in Quebec. It preserves fossils dating back to the early Silurian period.

Description

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The formation is divided into 4 members (from the base up): the Lachute, Innommée, Sandtop and Macgilvray members. The formation was deposited some 40–80 km offshore from the stable Laurentian craton, underwater at depths of 30 to 60 meters.[1]

Fossil content

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Vertebrates

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Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Conodonts
Genus Species Presence Material Notes Images
Anticostiodus A. fahraeusi Anticosti Island.[2]
A. boltoni Anticosti Island.[2]
Icriodella I. deflecta Probably instead belongs to the Jupiter Formation.[1]

Invertebrates

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Brachiopods
Genus Species Presence Material Notes Images
Brachyprion Sandtop and Macgilvray Members.[1] A strophomenid.
Coolinia Sandtop and Macgilvray Members.[1]
Fenestrirostra F. glacialis Lowermost part of the formation.[3] A rhynchonellidalso found in the Merrimack Formation.
F. pyrrha Lachute Member.[1] A rhynchonellid.
'Gotatrypa' 'G.' sp. Innommée Member.[1]
Hyattidina Sandtop to Macgilvray Members.[1] An athyrid.
Joviatrypa Uppermost Macgilvray Member.[1]
Kulumbella K. xacta Upper Macgilvray Member.[4][5] A pentamerid.
Mendacella Innommée Member.[1] A dalmanellid.
Meristina Innommée Member.[1]
Pentamerus P. palaformis Top of the formation (uppermost Macgilvray Member).[1][4] Also found in the Jupiter Formation.
Stegerhynchus [1]
Stricklandia S. gwelani Top of the formation (Macgilvray Member).[1][4] Also found in the Jupiter Formation.
S. sp. Innommée Member.[4] A509 (7 broken valves on a slab).[4] Also found in the uppermost Merrimack Formation.
Sypharatrypa S. sp. Innommée Member.[1]
Bryozoans
Genus Species Presence Material Notes Images
Phaenopora P. superba Also found in the Becscie Formation.[6]
Ptilodictya P. canadensis USNM 143039.[6]
P. sulcata USNM 143039, 143050; YPM 3063/98, 3063/104.[6]
Corals
Genus Species Presence Material Notes Images
Acidolites A. arctatus [7] A heliolitid.
Brachyelasma [1]
Crassilasma [1]
Helicelasma [1]
Palaearaea Cap aux Goélands (Uppermost Macgilvray Member).[1] Small colonies.[1] The only rugosan coral known from the formation, also found in the Menier formation.
Paleofavosites P. capax Multiple colonies.[8] A tabulate coral.
Crinoids
Genus Species Presence Material Notes Images
Dendrocrinus [1]
Eumyelodactylus Macgilvray Member.[1]
Laurocrinus Macgilvray Member.[1]
Stupatocrinus Macgilvray Member.[1]
Graptolites
Genus Species Presence Material Notes Images
Paraclimacograptus P. cf. innuitus Deeper water facies of the Sandtop Member.[1]
Sponges
Genus Species Presence Material Notes Images
Camptodictyon [1] A stromatoporoid.
Clathrodictyon [1] A stromatoporoid.

See also

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References

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