An investigation is underway after a father and son located human remains in rural Nevada County earlier this month, authorities said. 

Deputies said the two were recreating in the area of Banner Quaker Hill Road on July 21, which is a lengthy paved road that turns into a dirt, fire access road. 

When the father and son duo found the human remains, they called 911. Deputies and detectives responded and confirmed the remains were human. 

Deputies said due to the level of decomposition, the remains were not identified immediately. The remains were identified as those of 48-year-old Adrian Aaron Aaby of Grass Valley on Wednesday.

A cause of death has not been released at this time, but deputies believe those results will be released in the coming weeks.