<p>Caption on image: Pinnacles Crater Lake National Pk. 337 Patterson. 
 Filed in: Oregon--Crater Lake</p>
<p>The rocky spires (made of ash and pumice) were formed and hardened by volcanic gases spewing through tall vents.  Erosion later cut away the softer rock, leaving the Pinnacles that stand as much as 200 feet above the canyon floor.</p>
<ul><li>Subjects (LCTGM): Volcanic rock--Oregon--Crater Lake National Park; ; Rock formations--Oregon--Crater Lake National Park</li>
<li>Subjects (LCSH): Crater Lake National Park (Or.)</li></ul>
Frank Patterson
circa 1924 <div style="display: none;">date QS:P571,+1924-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external text" href="http://content.lib.washington.edu/alaskawcanadaweb/index.html">Alaska, Western Canada and United States Collection</a>