By the same reasoning, I can tell that the many dark gray to black pebbles—or the gray-greenish ones, all so common in the sidewalks where I live in Eugene, Oregon—are also volcanic. And it makes sense. Eugene gets most of its aggregate from a group of giant gravel quarries just no...
Privacy Policy | Terms of Use 409 S.E. 7th Street, Grants Pass, OR 97526-3003 | P.O. Box 1468, Grants Pass, OR 97528-0330 Phone: (541) 474-3700 | Toll-Free in Oregon: (800) 228-0457. Office Hours: Mon. - Fri. 8 a.m - 5 p.m....