The Washington County Sheriff's Office began investigating possible human remains found near Skiatook Tuesday afternoon.
A captain with WCSO said a man discovered what appears to have been a human skull on private property off Highway 11, five miles north of Skiatook.
"It has not been confirmed," Captain Gary Miller said. "All I can tell you, from the pictures I've seen, it does resemble a human skull."
The Skiatook Police Department was first contacted. Skiatook police then called the sheriff's office and deputies were called to the scene around 4:30 p.m. Tuesday.
The man who made the discovery Tuesday assisted deputies and showed them where he found it on the property.
"He was up here scrapping, he found it, picked it up and took it to Skiatook PD," Miller said.
WCSO will hold the scene overnight, while a search warrant is being obtained.
Authorities hope to begin searching the property Wednesday morning with assistance from the Oklahoma State Bureau of Investigation.
The Medical Examiner has also been in contact to have the suspected human skill examined.
If confirmed as a human skull, Miller said it would be a rare find.
"In this area, as long as I've been in this line of work, this is probably the third time in 30 years," Miller said.