Texas police are investigating after a pile of drugs washed up on a beach for the sixth time in a week, including more than 66 lbs. of cocaine tightly wrapped in plastic with a dolphin stamp on it.

On Monday, police say they received a call from beach patrol about a collection of suspicious packages that washed ashore in Galveston. They seized 30 bricks of cocaine — believed to belong to the Gulf Cartel because of the unique stamp — worth more than $1 million, investigators said.

Police have also recovered four bundles of marijuana and another batch of cocaine that washed ashore.

"It's not unlikely to see one (package of drugs wash ashore) each month, or one each couple of months. Six in a week is obviously elevated," Sgt. Joshua Schirard of the Galveston Police Department told the Houston Chronicle.

Schirard said drug cartels are known to sink their narcotics and mark them with a buoy for pick up by another group, but they can float away. Other times, traffickers toss their drugs overboard to avoid authorities and they eventually turn up ashore, he said.