Tolovana Beach sand Image Posted on May 29, 2012 by poikiloblastic Quartz (white) and plagioclase (yellowish) dominate this sand collected from the edge of a tide-pool on Tolovana Beach near Arch Cape, Oregon. The regional geology is dominated by basalt overlying marine sediments. About these ads Share this:PrintMoreDiggShare on TumblrEmailLike this:Like Loading...