Thousands of rounds of rifle ammunition, a gun, bottle rockets and firecrackers were found Saturday when a Sonoma County sheriff’s deputy stopped to check on a suspicious man sitting in the bed of a pickup, according to the Sheriff’s Office.

Deputy Joe Myers was on Geysers Road about 2 a.m. Saturday when he saw a man with a headlamp duck down into the truck bed as the deputy approached, sheriff’s Sgt. Spencer Crum said Monday.

The man, Cean Garner, 33, was previously convicted of a robbery, and last month was arrested on suspicion of drugs and weapons charges, Crum said. The criminal history makes it illegal for him to have a gun or ammunition.

Garner, who was wearing an empty gun holster, had a magazine of .45‑caliber rounds in his pocket. A search of the truck bed turned up a .45‑caliber pistol, 49 large‑capacity rifle magazines, several bags of ammunition and eight ammunition cans holding as much as 20,000 rounds of ammunition, Crum said.

Deputies also found bottle rockets, firecrackers and a launching tube for large fireworks.

“He says he was up there to see the stars,” Crum said.

Garner, a transient, was arrested on suspicion of five felonies involving the gun and ammunition possession and a misdemeanor violation of possessing dangerous fireworks. Deputies booked him into the Sonoma County Jail on $30,000 bail.

You can reach Staff Writer Randi Rossmann at 707‑521-5412 or randi.rossmann@pressdemocrat.com. On Twitter@rossmannreport.