Jupiter Formation

The Jupiter Formation is a geologic formation in Quebec, well-exposed in the southern third of Anticosti Island and lying in the St Lawrence River Valley.^[1] It preserves fossils dating back to the Silurian period.

Jupiter Formation
Stratigraphic range: Early Silurian (Aeronian-Telychian) 440.8–433.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	From the base upwards: Goéland Member East Point Member Richardson Member Cybèle Member Ferrum Member Pavillon Member
Overlies	Gun River Formation[1]
Thickness	167 meters[1]
Location
Region	Quebec
Country	Canada
Type section
Named for	Jupiter River
Named by	Schuchert and Twenhofel[1]
Year defined	1910[1]

Fossil content

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.

Trace Fossils

Trace fossils
Genus	Species	Presence	Material	Notes	Images
Klemmatoica	K. linguliforma	Goéland Member.[2]	Associated with the brachiopod Rowellella and the shell of a Phanerotrema.[2]
Trypanites		Goéland Member.[3]	Borings in gastropod shells.[3]

Vertebrates

Conodonts
Genus	Species	Presence	Material	Notes	Images
Icriodella	I. deflecta	Lower two members.[4]		Material originally thought to be from the Gun River Formation.[4]

Invertebrates

Brachiopods
Genus	Species	Presence	Material	Notes	Images
Clorinda	C. (Phricoclorinda) chaloupensis	Cybèle Member.[5]	A749 (112, mostly well-preserved); A850 (178); A937 (about 100,some embedded in small blocks); A939 (44); A1040 (105); A1047 (1); A1064b (76); A1125 (68).[5]
	C. tumidula	Goéland, Richardson, Ferrum and Pavillon Members.[5]
	C. superundata	Goéland Member[5]
Costistricklandia	C. brevis	Pavillon Member.[5]	"A279b (1 broken ventral valve, 1 small slab with interiors exposed) and A333 (>10 fragmentary, disarticulated valves)".[5]
	C. gaspeensis	Pavillon Member (top).[5]	A 107-108 (1); A 279b (5 broken valves on small slab); A281 (3); A418-5 (10 valves on slabs); A554 (2).[5]
Dihelictera	D. acrolopha	East Point Member.[6]	Several hundred specimens.[6]
Ehlersella	E. davidsonii	Cybèle and Ferrum members.[5]
	E. transulcata	Basal Ferrum Member.[5]	A 185 (a crushed shell) and A 1066b (32, variously damaged).[5]
Joviatrypa	J. brabyla	Lower Goéland Member.[6]	Several thousand specimens.[6]
Microcardinalia	M. (Chiastodoca) salterii	Ferrum Member[5]
	M. (Chiastodoca) richardsoni	Goéland and Richardson members.[5]
	M. (Chiastodoca) fabatina	Upper Ferrum Member.[5]	A101 (270 specimens).[5]
	M. (Dauphinella) divaricata	Cybèle and Ferrum members.[5]
	M. (Dauphinella) melissa	Uppermost Ferrum Member and Pavillon Member.[5]
	M. (Dauphinella) sp.	Ferrum and Pavillon Members.[5]	A255 (16 free shells, 6 slabs with shells in life position) and A108 (1 specimen).[5]
Parastrophinella	P. ops	Upper Richardson Member.[5]	A1158 (3 shells).[5]
	P. sp.	East Point Member and Ferrum Member.[5]	A863 (1 shell) and A959 (1 shell).[5]
Pentameroides	P. subrectus	Pavillon Member.[5]	"A333 (about 1 conjoined shell; 40 incomplete specimens), A 1395 (6 conjoined shells, 12 ventral valves)".[5]
Pentamerus	P. oblongus	Richardson, Cybèle, Ferrum and Pavillon Members.[5]
	P. palaformis	Goéland Member.[5]		Also found in the Gun River Formation.
Rowellella	R.? anticostiensis	Goéland Member.[2]	Specimen associated with the shell of a Phanerotrema and the trace fossil Klemmatoica linguliforma.[2]	A lingulid.
Stricklandia	S. gwelani	Goéland Member.[5]		Also found in the Gun River Formation.
	S. planirostrata	Ferrum Member.[5]

Corals
Genus	Species	Presence	Material	Notes	Images
Acidolites	A. sp.			An unnamed species of the genus.[7]

Cornulitids
Genus	Species	Presence	Material	Notes	Images
Conchicolites		Goéland Member.[2]	Two individuals encrusting the surface of a Clathrodictyon, which itself is associated with a Phanerotrema shell.[2]

Echinoderms
Genus	Species	Presence	Material	Notes	Images
Perforocycloides	P. nathalieae	Cybèle Member.[8]	MPEP335.7.[8]	A cyclocystoid.
Rhenopyrgus	R. viviani	Cybèle Member to Pavillon Member.[9]		An edrioasteroid.

Gastropods
Genus	Species	Presence	Material	Notes	Images
Phanerotrema	P. sp.	Goéland Member.[3][2]	Shells, some with Trypanites borings or other associated organisms.[3][2]	A phanerotrematid.

Sponges
Genus	Species	Presence	Material	Notes	Images
Clathrodictyon		Goéland Member.[2]	Specimen found growing on a Phanerotrema shell.[2]	A stromatoporoid.

Trilobites
Genus	Species	Presence	Material	Notes	Images
Encrinurus	E. deomenos	[10]

See also

• Earth sciences portal
• Canada portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Quebec