Not necessarily the way every DS fan sees things, but this episodes breakdown of the various DS storylines from the DS Almanacs can prove to be a useful tool for anyone who might not be sure from which storyline a particular screen capture has been taken:
Victoria's Arrival (episodes 1-6)
The Revenge of Burke Devlin (episodes 1-201)
Matthew Morgan Kills Bill Malloy and Kidnaps Victoria (episodes 46-126)
Laura the Phoenix (episodes 123-191)
[Apparently nothing really happens in episode 192.
]
The Blackmailing of Elizabeth (episodes 193-275)
The Introduction of Barnabas (episodes 202-220)
The Kidnapping of Maggie (episodes 221-261)
[Similarly, nothing must happen in episodes 262-264.
]
The Introduction of Julia (episodes 265-365)
1795 (episodes 365-461)
The Dream Curse (episodes 461-536)
The Creation of Adam and Eve (episodes 486-626)
Return To 1796 (episodes 657-667)
The Werewolf and Quentin's Ghost (episodes 627-700)
1897 (episodes 700-884)
The Leviathans (episodes 885-980)
Quentin and Amanda (episodes 904-934)
1970 Parallel Time (episodes 980-1060)
[Actually, this should be 969-1060 because glimpses of PT are seen well before Barnabas actually goes there.]
1995 (episodes 1061-1070)
The Ghosts of Daphne and Gerard (episodes 1070-1109)
[Though, of course, both appear in 1995 as well.]
1840 (episodes 1110-1198)
1841 Parallel Time (episodes 1198-1245)
[Though, similarly to 1970PT, this should be 1186-1245 because glimpses of PT are seen well before the focus completely shifts there.)