Norway Point Formation Explained

Norway Point Formation
Type:	Geological formation
Period:	Devonian
Unitof:	Traverse Group
Overlies:	Four Mile Dam Formation

The Norway Point Formation is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.

Fossil content

Vertebrates

Conodonts
Genus	Species	Presence	Material	Notes	Images
Acodina	A. formosa		^[2]	Also found in the Detroit River, Traverse, Dundee, Bell, Alpena and Four Mile Dam formations.
	A. lanceolata			Also found in the Traverse Formation.
Belodella	B. devonicus			Also found in the Detroit River, Traverse, Antrim, Alpena and Four Mile Dam formations.
Hindeodella	H. germana			Also found in the Detroit River, Traverse and Antrim formations.
Icriodus	I. cymbiformis			Also found in the Detroit River, Traverse, Antrim, Ferron Point, Genshaw, Alpena and Thunder Bay formations.
	I. expansus			Also found in the Detroit River, Traverse, Antrim, Lucas, Anderdon, Dundee, Bell, Ferron Point, Genshaw, Alpena, Potter Farm and Thunder Bay formations.
	I. latericrescens latericrescens			Also found in the Traverse, Bell, Ferron Point, Genshaw, Newton Creek, Alpena, Four Mile Dam, Potter Farm and Thunder Bay formations.
Ligonodina	L. falciformis			Also found in the Traverse Formation and Alpena Limestone.
Ozarkodina	O. willsi			Also found in the Detroit River, Traverse, Antrim, Dundee, Alpena and Four Mile Dam formations.
Polygnathus	P. linguiformis linguiformis			Also found in the Detroit River, Traverse, Antrim, Dundee, Bell and Alpena formations.
	P. varcus			Also found in the Traverse, Antrim, Alpena, Four Mile Dam and Thunder Bay formations.
Synprioniodina	S. regularis			Also found in the Detroit River, Traverse, Antrim, Dundee, Bell and Alpena formations.

Invertebrates

Brachiopods
Genus	Species	Presence	Material	Notes	Images
Chonetes	C. pachyactis		^[3]
Leptalosia	L. radicans			Also found in the Gravel Point, Alpena, Four Mile Dam, Genshaw, Arkona and Hungry Hollow formations.
Pentamerella	P. pericosta			Also found in the Beebe School, Widder, Hungry Hollow and Logansport formations.
Pholidostrophia	P. ovata			Also found in the upper Widder Formation.
Protoleptostrophia	P. lirella			Also found in the Four Mile Dam Formation and Alpena Limestone.
Schuchertella	S. lirella	At Thunder Bay River.
Sphenophragmus	S. nanus			Also found in the Beebe School, Ludlowville, Wanakah and Widder formations.
Strophodonta	S. alpenensis			A strophomenid.
Truncalosia	T. gibbosa			Also found in the Genshaw, Alpena, Gravel Point, Petoskey, Potter Farm and Arkona formations, and the Hamilton Group.
Tylothyris	T. subvaricosa		^[4]	Also found in the Cedar Valley, Milwaukee, Mineola, Bell, Rockport Quarry, Ferron Point, Genshaw, Alpena, Gravel Point and Potter Farm formations.

Corals
Genus	Species	Presence	Material	Notes	Images
Aulocystis	A. commensalis	^[5]		Also found in the Ipperwash Limestone and Wanakah Shale.
	A. stummi	Thunder Bay River below Four Mile Dam, Alpena County, Michigan.

Ostracods
Genus	Species	Presence	Material	Notes	Images
Aechmina	A. choanobasota		2 right valves.^[6]
	A. sp. A		2 right valves.
	A. sp. B		A carapace, No. 29828.
Arcyzona	A. aperticarinata
	A. diademata		A carapace and right valve.
	A. sp.		2 carapaces.
Barychilina	B. embrithes		A left valve
	B. labyrinthea		A carapace.
	B. sp.		A left valve.
Birdsallella	B. delawarensis
	B. tumida
Bythocypris	B. devonica borealis		A carapace.
	B. parsonia		A carapace.
	B. subquadrata		2 carapaces.
Coelonella	C. scapha		2 carapaces.
Ctenoloculina	C. cicatricosa
Dizygopleura	D. euglyphea		A left valve.
Euglyphella	E. compressa		A right valve.
	E. sigmoidalis
	E. simplex
Eukloedenella	E. doverensis		One female left valve and one male left valve.
Falsipollex	F. equipapillatus
Glyptopleura	G. bipunctata
Halliella	H. bellipuncta		2 right valves.
Healdia	H. gibba
	H. sp.		A right valve.
Hollinella	H. ampla		A left valve.
	H. inclinisulcata
	H. labrosa		3 right valves.
	H. tendilobata
	H. sp. A		"Two carapaces, Nos. 27352 and 27353".
	H. sp. B		"A male carapace, No. 27354".
Hyphasmaphora	H. textiligera		2 right valves.
Jenningsina	J. catenulata
	J. scalpta		A left valve.
Lucasella	L. mundula
Monoceratina	M. casei		"2 carapaces, Nos. 27374 and 27375".
Octonaria	O. crescentiformis
	O. quadricostata
Parabolbina	P. acinina		2 male right valves.
Ponderodictya	P. punctulifera
	P. sp.		One specimen (No. 29891).	May be an early instar of P. punctulifera.
Punctoprimitia	P. subaequalis		1 right valve and 4 left valves.
Quasillites	Q. binodosus
	Q. jubatus
	Q. lobatus		A right valve.
	Q. obliquus		A carapace.
	Q. cf. Q. ornatus		A carapace.
	Q. ornatus		3 carapaces and a right valve.
Reticestus	R. acclivitatus
Ropolonellus	R. papillatus		A right valve.
	R. plenus		A right valve.
Ruptivelum	R. bacculatum
Subligaculum	S. biorthogonium
	S. trullatum		2 male left valves and a broken female right valve.
Tetrasacculus	T. paeneloculatus
Ulrichia	U. fragilis		1 carapace and 2 left valves.
	U. spinifera		3 right valves.

Trilobites
Genus	Species	Presence	Material	Notes	Images
Dechenella	D. (Basidechenella) sp. A		"Nos. 25506, 28719, 28720, and 28721".^[7]
Dipleura	D. dekayi	"Shales just above the Spinocyrtia zone".		Also found in the Thunder Bay Limestone.
Eldredgeops	E. rana			Originally reported as Phacops rana. Also found in the Hamilton, Hungry Hollow, Widder, Plum Brook, Prout, Ten Mile Creek, Alpena, Four Mile Dam and Gravel Point formations.
Greenops	G. aequituberculatus			Also found in the Gravel Point Formation and Dock Street clay of the Four Mile Dam Formation.
Phacops	P. rana			Moved to the genus Eldredgeops.

See also

• List of fossiliferous stratigraphic units in Michigan

References

• Web site: Fossilworks: Gateway to the Paleobiology Database. ((Various Contributors to the Paleobiology Database)). 17 December 2021. dmy-all.

Notes and References

1. Stack . Jack . Sallan . Lauren . 2018-09-20 . An examination of the Devonian fishes of Michigan . PeerJ . 6 . 2 . e5636 . 10.7717/peerj.5636. 30258725 . 6151260 . free .
2. Orr . R. William . 1971 . Conodonts from Middle Devonian Strata from the Michigan Basin . en-US.
3. Imbrie . John . 1959 . Brachiopods of the Traverse group (Devonian) of Michigan. Part 1, Dalmanellacea, Pentameracea, Strophomenacea, Orthotetacea, Chonetacea, and Productacea. Bulletin of the AMNH ; v. 116, article 4 . 2246/1258 . en-US.
4. Rogers . Frederick S. . Pitrat . Charles W. . May 1987 . Distribution of Tylothyris (Brachiopoda) and its occurrence in the Traverse Group (Middle Devonian) of Michigan . Journal of Paleontology . en . 61 . 3 . 494–507 . 10.1017/S0022336000028651 . 130922140 . 0022-3360.
5. Watkins . J. Lloyd . 1959 . Middle Devonian Auloporid Corals from the Traverse Group of Michigan . Journal of Paleontology . 33 . 5 . 793–808 . 1300915 . 0022-3360.
6. Kesling . R. V. . Weiss . Martin . 1953 . Ostracods from the Norway Point Formation of Michigan . 2027.42/48276 . en-US.
7. Stumm. Erwin. 1953. Trilobites of the Devonian Traverse Group of Michigan. University of Michigan Press - Museum of Paleontology.