NPS home USGS home USGS/NPS banner
http://coastal.er.usgs.gov/response/wa-or/locations/98.html
Seastack, Central California
Sea stack along Oregon’s northwest coast. Image from USGS Center for Coastal Geology.

Sea Stack

spacer image Sea stacks are blocks of erosion-resistant rock isolated from the land by sea. Sea stacks begin as part of a headland or sea cliff. Relentless pounding by waves erodes the softer, weaker parts of a rock first, leaving harder, more resistant rock behind.
spacer image Click here to see Jump-off Joe, a sea stack, erode over 100 years.
| Return to Where Parks Meet the Sea index |

horizontal bar
| USGS Geology in the Parks home | NPS Park Geology Tour home |

This site is a cooperative project of the
US Geological Survey Western Earth Surface Processes Team
and the National Park Service.

Please share your comments and suggestions with us!
parkgeology@den.nps.gov

http://www.nature.nps.gov/grd/usgsnps/sea/gseastack.html
This page was last updated on 9/10/99