Dinosaur King: Fierce Battle! Zanjark!

Apparently, Alpha gang had actually gave up, of course, they still battle against you, but no more activities that trigger the stone slab. But then, a new enemy appears, Zanjark, space pirates who, using dinosaurs, want's power on the universe, and now, D-team has to stop them, battling trough ancient rome, and a zanjark base.

More details are unknown since this is the only arcade version which wasn't preserved for emulation.

Résumé

The fourth entry of the arcade machine series, where you fight with dinosaurs with a rock, paper, scissors enhanced system.

This version brings a totally new story, where apparently Alpha gang stop being a menace to the dinosaurs, but now, the D-Team has to face a new enemy, Zanjark, space pirates who want universal dominance.
This entry has the habitual new dinosaurs and moves introduction, but also, added the first power up/gimmick to the series, Armored dinosaur, Dinotector for the heroes, and Jark armors for the enemies.