List of fossiliferous stratigraphic units in Maryland

Group or Formation	Period	Notes
Allegheny Formation	Carboniferous
Antietam Formation	Cambrian
Aquia Formation	Paleogene
Brightseat Formation	Paleogene
Calvert Formation	Neogene
Chatham Group/Gettysburg Formation	Triassic
Chemung Formation	Devonian
Chesapeake Group/Calvert Formation	Neogene
Chesapeake/Choptank Formation	Neogene
Chesapeake/St. Marys Formation	Neogene
Clinton Group/Keefer Sandstone	Silurian
Clinton/Rochester Shale	Silurian
Clinton/Rose Hill Formation	Silurian
Conemaugh Group	Carboniferous
Dunkard Group/Greene Formation	Permian
Foreknobs Formation	Devonian
Greenland Gap Group/Foreknobs Formation	Devonian
Jennings Formation	Devonian
Aquia Formation	Paleogene
Magothy Formation	Cretaceous
Marcellus Formation	Devonian
Matawan Formation	Cretaceous
McKenzie Formation	Silurian
Merchantville Formation	Cretaceous
Mifflintown Formation	Silurian
Monmouth Formation	Cretaceous
Nanjemoy Formation	Paleogene
Onondaga Formation	Devonian
Pamlico Formation
Pamunkey Group/Aquia Formation	Paleogene
Pamunkey/Brightseat Formation	Paleogene
Pamunkey/Nanjemoy Formation	Paleogene
Arundel Clay	Cretaceous
Patapsco Formation	Cretaceous
Patuxent Formation	Cretaceous
Rockdale Run Formation	Ordovician
Romney Formation	Devonian
Severn Formation	Cretaceous
St. Marys Formation	Neogene
Stonehenge Limestone	Ordovician
Talbot Formation
Tonoloway Limestone	Silurian
Williamsport Sandstone	Silurian
Wills Creek Limestone	Silurian

References

Wikisource has original works on the topic: Paleontology in the United States#Maryland

Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 22 June 2014.

Lists of fossiliferous stratigraphic units in the United States

States	Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

Federal district	Washington, D.C.

Insular areas	American Samoa Guam Northern Mariana Islands Puerto Rico U.S. Virgin Islands

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