I divided it into four general "ages" (Golden Age, Silver Age, Bronze Age, and Modern Age), as well as the most commonly accepted "eras" in the band's history (Classic era, Band era, etc). Hope you like it.
http://img543.imageshack.us/img543/7356/thebeachboysatimeline.png-Golden Age is
Surfin' Safari to
Pet Sounds.
-Silver Age is
Smiley Smile to
Endless Summer.
-Bronze Age is
Endless Summer to Carl Wilson's death.
-Modern Age is from then to now.
-Classic Era is
Surfin' Safari to
All Summer Long.
-Innovation Era is
Today! to
Summer Days (and Summer Nights).
-Genius Era is
Pet Sounds to the cancellation of
Smile.
-Band Era is
Smiley Smile to
Endless Summer.
-
Love You Era is
15 Big Ones to
Adult/Child's failure to get released.
-Mike Love Era is
MIU Album to Dennis Wilson's death.
-Stamos Era is Dennis Wilson's death to Carl Wilson's death.
-Modern Era is where we are now.