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Periods:

period	Formations	Groups
Eocene	link	link
Cretaceous	link	link
Jurrasic	link	link
Triassic	link	link
Permian	link	link
Pennsylvanian	link	link
Mississippian	link	link
Devonian	link	link
Ordivician	link	link
Cambrian	link	link
None	NaN	NaN

References:

USGS Texas Formation List