Merrimack Formation Explained

Merrimack Formation
Type:	Geological formation
Age:	Silurian
Period:	Silurian
Underlies:	Gun River Formation^[1]

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

Fossil content

Brachiopods
Genus	Species	Presence	Material	Notes	Images
Cerasina	C. pycnata	Near Merrimack Point, northeastern coast of Anticosti Island.^[2]	More than 200 specimens.	Genus renamed to Cerasinella.^[3]
Cerasinella	C. pycnata	Near Merrimack Point, northeastern coast of Anticosti Island.	More than 200 specimens.	An atrypoid originally named Cerasina.
Fenestrirostra	F. glacialis	Middle and upper beds of the formation.^[4]		A rhynchonellid also found in the lowermost Gun River Formation.
	F. primaeva	Lower part of the middle Merrimack Formation.		A rhynchonellid.
Stricklandia	S. sp.		"A22=C683 (2 broken shells); A1242 (15, broken); A1329 (1 broken dorsal valve)".^[5]	Also found in the Gun River Formation.
Virgiana	V. mayvillensis		"A505 (1 shell); A 739 (5, all broken); A 741 (33, most damaged); A842 (38, most damaged); A 1330 (12 shells)".

See also

• List of fossiliferous stratigraphic units in Quebec

References

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

Notes and References

1. Copper . Paul . Long . Darrel G. F. . Jin . Jisuo . 2012 . The Early Silurian Gun River Formation of Anticosti Island, eastern Canada: A key section for the mid-Llandovery of North America . Newsletters on Stratigraphy . 45 . 3 . 263 . 10.1127/0078-0421/2012/0024 . 0078-0421.
2. Copper . Paul . September 1995 . Five new genera of Late Ordovician-Early Silurian brachiopods from Anticosti Island, eastern Canada . Journal of Paleontology . 69 . 5 . 846–862 . 10.1017/s0022336000035526 . 132079646 . 0022-3360.
3. Copper . Paul . September 2015 . Cerasinella, A replacement name for the Silurian brachiopod genus Cerasina Copper 1995, Anticosti Island . Journal of Paleontology . en . 89 . 5 . 894 . 10.1017/jpa.2015.55 . 130558774 . 0022-3360.
4. Jin . Jisuo . Caldwell . W. G. E. . Copper . Paul . March 1990 . Evolution of the Early Silurian rhynchonellid brachiopod Fenestrirostra in the Anticosti Basin of Quebec . Journal of Paleontology . 64 . 2 . 214–222 . 10.1017/s0022336000018370 . 132248649 . 0022-3360.
5. Jin . Jisuo . Copper . Paul . Late Ordovician and Early Silurian pentamerid brachiopods of Anticosti Island, Québec, Canada . Palaeontographica Canadiana.