Columbia River Basalt Group map shows main regions of basalt exposure in Washington, Oregon, Idaho and Nevada, USA. (usgs.gov)
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/mountain-ranges/wallowa-mountains/wallowa-mountains.md
The Denny Party landed at Alki Point November 13, 1851, and platted a settlement of six blocks of eight lots, calling the settlement “New York Alki”.