Columbia subject headings:
Geology, Stratigraphic--Ordovician.
Geology--East (U.S.)
Geology--Québec (Province)
Petroleum--Geology.
Trenton Group.
Harvard subject headings:
Geology, Stratigraphic--Ordovician
Geology--East (U.S.)
Geology--Québec (Province)
Petroleum--Geology
Trenton Group.
Princeton subject headings:
Geology, Stratigraphic--Ordovician.
Geology--East (U.S.).
Geology--Québec (Province)
Petroleum--Geology.
Trenton Group.