New Maps Offer a Modern Look at the Geology of Coastal Coos County | New

COOS COUNTY – New mapping of the Oregon coast improves understanding of geological resources and hazards in an area that has not been mapped in decades.

On December 30, the Oregon Department of Geology and Mineral Industries released geological maps of the Coos County coast between Bandon, Coquille and Sunset Bay. The last geological mapping of the coastal county of Coos dates back to the 1970s.

“For the south coast of Oregon, it is especially important to know more about the land that may be prone to landslides, as well as the nature of the seismic risk,” said Tom Wiley, DOGAMI geologist. “This mapping and data is essential for studying these and other hazards.”

The new mapping is part of a multi-year project, launched in 2012, to map the Oregon coast from the California border north to Coos Bay. The effort is supported in part by the STATEMAP component of the US Geological Survey of the National Cooperative Geological Mapping Program.

The beaches are the best places to get a glimpse of the geology of the area, Wiley said. See state parks, including Shore Acres State Park, where erosion has shaped a shoreline with spikes of land, reefs, islands, and secluded coves that are radically unlike any other area in the rating. The predominant rock unit, the Coaledo Formation, contains numerous marine fossils.

“Geological map of the southern Oregon coast between Bandon, Coquille and Sunset Bay, Coos County, Oregon”, by Thomas J. Wiley, Jason D. McClaughry, Clark A. Niewendorp, Lina Ma, Heather H. Herinckx and Katherine A. Mickelson contains map plates, report, geodatabase, GIS files, and spreadsheets. The publication is available free of charge. Download here:

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