Jack Thorne owned a Jeep, the make and model of which is unknown. It is known that he used this vehicle to transport himself, Arby Benton and Kelly Curtis to Levine’s apartment and back. He also used this vehicle to transport himself and Ian Malcolm to the San Francisco airport as they were prepared to head off to their expedition to Isla Sorna. Presumably, the Jeep was picked up from the parking structure when the group returned from their expedition.
The Lost World. by Michael Crichton page 87,98-99 (First Edition, Thirty Fourth printing)