| Many canyons on the outer slopes of todays Crater Lake volcano are deeply eroded into pyroclastic deposits of the great cladera-forming eruption of Mount Mazama nearly 7000 years ago. Irregular weathering and erosion has led to the formation of many spectacular pinnacles. The one on the left in this picture is clearly the result of the protection from rain by the prominent rock now balancing on its top. Other pinnacles may have been formed where the pumice was solidified by fumarolic gases rising along vertical vents. Here are 3D-views of other pinnacles (you need red-blue glasses to see the stereoscopic effect): stereo picture 1 | stereo picture 2 |
