Dave Parks, a Port Angeles geologist with the Washington Department of Natural Resources, leads a “Rock Walk” at the Dungeness National Wildlife Refuge on Saturday, July 28.

The program starts at 10 a.m. and is expected to last about 90 minutes. The program is free; however, there is a required Refuge entrance fee of $3 which covers up to four adults while children 15 years of age and younger enter for free.

The “Rock Walk” will begin at the upper overlook at the top of the trail leading down to the Dungeness Spit. Participants should wear sturdy walking shoes and weather-appropriate clothing.

Parks, a licensed Engineering geologist and hydro-geologist, will discuss the geologic history and coastal evolution of Dungeness Spit and examine the stratigraphy of the coastal bluffs west of the base of the Spit. He will also discuss recent research on the rates of coastal bluff erosion in the Dungeness drift cell.

For more information, call the Refuge office at 360-457-8451 x25, or email to david_falzetti@fws.gov.