Template:Chronostratigraphy of Maryland

Serpukhovian	Greenbrier Formation Mauch Chunk Formation
Viséan	Greenbrier Formation Purseland Sandstone
Tournaisian	Purseland Sandstone Rockwell Formation

Famennian	Hampshire Formation Rockwell Formation
Frasnian	Brallier Formation Foreknobs Formation Greenland Gap Group Harrel Shale Scherr Formation

Givetian	Mahantango Formation
Eifelian	Marcellus Shale Needmore Shale

Emsian	Helderberg Formation Mandata Shale Needmore Shale Oriskany Sandstone Shriver Chert
Pragian	Corriganville Limestone Helderberg Formation
Lochkovian	Keyser Limestone New Creek Limestone