Sun Notch – Prominent Geological Features of Crater Lake National Park
The canyons of Sand and Sun creeks are among the most striking glacial phenomena of Mount Mazama. The notches they make in the rim are prominent features. The canyons are clearly of the glacial form. Their walls are glaciated and their floors strewn with morainal deposits … In the case of Sun Creek the conditions are somewhat different. For 2 miles from the crest the grade is gentle and the broad even floor is on glacial debris; then the creek descends abruptly, …. [Glaciation of Mount Mazama, The Geology and Petrography of Crater Lake National Park (1902)]
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