Jake was sitting on a rock, waiting for Cris to reappear, and watching the slick. He had taken a couple of photos of the surface of the water while he waited as well.
"It looks like an oil slick, but... I dunno. You need to get samples. If we get enough samples, then all the science people back in the city can work out if it's normal oil or not. And if you have your phone with you, you should film it so they can see where it's coming from."
He got to his feet and took off his carry-pouch. He took his phone out, since it was waterproof, and looked through to see what else he had. There was the little bottle Laura had given him for water when he was hallucinating. They could put some of the oil stuff in that. "Can you get close enough to the black stuff and catch it in this?" he asked Cris, holding the bottle out towards him.