Prime Timeline
   | Year | Event | 
   | 37,600 bc | 
       ● [1]
         A group of aliens from the Delta Quadrant visit Earth and are greatly impressed by the spirituality of those Humans living on the Siberian Peninsula. [1] | 
   | 2053 | 
       ● [2]
         The Vulcans make first contact with the Arkonians. The initial contact goes well but the Arkonians prove hostile and difficult to deal with, and eventually contact is broken off. [2] | 
   
Colour key
● - Shows the canon status and reference of the year for this event
References
| # | Series | Season | Source | Comment | 
| 1 | ENT | 2 | Dawn | The alien said this happened 40,000 years ago. This is a rounded date | 
| 2 | ENT | 2 | Dawn | T'Pol said that this happened almost a hundred years ago; this is 99 years before the episode |