Jackson made 116 off 149 balls with the help of 15 boundaries and two sixes, while Chirag Jani scored 78 off 117 balls to form the base for Saurashtra's total after being sent into bat at the Karnail Singh Stadium here.
Jani struck 11 boundaries and one hit over the fence during his 117-ball knock.
Apart from the duo, opener Snell Patel made 40 Prerak Mankad scored 28.
At stumps, Vidarbha were four for no loss with openers and still trail Saurashtra by 297 runs.
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Brief Scores:
Saurashtra: 301 all out in 86.1 overs (Sheldon Jackson 116, Chirag Jani 78; Rajneesh Gurbani 4/85).
Vidarbha: 4 for no loss in one over.