While Jadeja came to his team's rescue from 66 for three, Cheteswar Pujara (10) failed to get going.
Another handy contribution came from Sheldon Jackson, who remained unbeaten on 82 at stumps.
Jadeja, who has fallen out of favour with the Indian team selectors, occupied the crease for 138 balls and scored at a decent strike rate of 65.94. He ended with 11 boundaries.
Sheldon too played a solid knock when his team needed. His 152-ball innings comprised eight fours and a six.
Brief scores: Saurashtra 270/6 in 90 overs (Ravindra Jadeja 91, Sheldon Jackson 82 batting, Abhijit Dey 4/107).