Time immemorial: Time so long past as to be indefinite in history or tradition; a time predating the keeping of records.
This index is for the pages on This Very Wiki that have survived since the earliest days of the site. They've lived through The Google Incident, The Second Google Incident, the The Content Policy, all manner of drama and Trope Repair, and still they stand.
How does a page qualify for this honor? On the sidebar of each page there's a section called page info. If the page says it was created on Jun. 14, 2007 or earlier, it qualifies. Before then, we didn't track the creation of page dates. Many of these pages have existed for so long that we don't know when they were made without looking them up through the Wayback Machine. Since the wiki was founded in 2004, any page that's this old has seen most of the history of TV Tropes, and this index shows how far this wiki has come.