A project of the
Oregon Historical Society

Search

Explore
- Entries A-Z
  Browse the complete list of entries
- Entries by Themes
  Browse curated collections of entries
For Educators
- In the Classroom
- Primary Source Packets
Support Us
- Donate
- Donors
About Us
Digital Exhibits

The Oregon Historical Society is a 501(c)(3) non-profit organization. Federal Tax ID 93-0391599

clinker

In geology, chunks of solidified lava that float on top of flowing lava.

The Oregon Historical Society is a 501(c)(3) non-profit organization. Federal Tax ID 93-0391599