Trying to put the whole De-extinction experiments in order since there's seems to be some confusion hope this helps

1975-1983: the research era - The era where the research and creation of technology and other material needed to clone and maintain prehistoric life * Super plants to maintain large animals * Cloning species of the avain, reptile family * Accelerated maturity rate in large animals * Recombination and extracting DNA testing

1983-1985: the experimental era - The fire true De-exitnction experiments on the island seen in rebirth, I like to believe that this island was a private island owned by John Hammond or Lockwood pre-1975 these experiments lead to many trials and errors which includes the D-rex, these prototypes where left to fend for themselves or stuffed and put in Lockwood manor.

1986-1991: the production/success ers - After the experimental era De-extinction experiments are moved to Lockwood manor as operations where getting to expensive and dangerous and in 1986 the first true dinosaur, a triceratops was created at Lockwood manor after perfecting the process full cloning operations where moved to a newly bought Isla sorna and Isla nublar.