1967: 20-mile long oil slick discovered off Chatham
"Gobs of heavy oil" washed ashore the next day
On this day in 1967, an oil slick of mysterious origin was spotted in the waters off Chatham.
The slick stretched 20 miles in length and six miles across to the southeast of the Pollock Rip lightship, the Coast Guard reported to the Associated Press.
The following day, "gobs of heavy oil" washed ashore on Nantucket, plastering beaches from Great Point to Siasconset.