Answer:

eras

Answer	Crossword Clue
ERAS	Closers' stats
ERAS	History chapters
ERAS	Memorable times

ERAS	Mesozoic and Paleozoic
ERAS	Notable periods
ERAS	Notable time periods
ERAS	Significant times
ERAS	Starters' stats
ERAS	Chapters of history
ERAS	Christian and others
ERAS	Important periods

ERAS	Important times
ERAS	Newsworthy times
ERAS	Notable times
ERAS	Old times
ERAS	Periods of time
ERAS	Sports-page stats
ERAS	They're history
ERAS	Ages

ERAS	Historic periods
ERAS	Paleocene and Cenozoic
ERAS	Paleozoic and Mesozoic
ERAS	Time periods
ERAS	History sections
ERAS	Long stretches
ERAS	Blocks of time
ERAS	Colorful aquarium fish

ERAS	Historical chunks
ERAS	Important stretches
ERAS	Stats that are usually low in the playoffs
ERAS	Paleozoic and Precambrian
ERAS	Epochs
ERAS	Significant periods
ERAS	They often end in -zoic
ERAS	Geologists' units

ERAS	Times to remember
ERAS	Time pieces
ERAS	Noteworthy periods
ERAS	Memorable periods
ERAS	Pitching stats