This map area includes the highest elevations of Mount Shasta and Shastina. It extends from tree line, at about 8000 feet elevation to the summit. This terrain is formed by lava flows, PYROCLASTIC FLOWS and ash and PUMICE deposits. The most recent eruptions were from the summit cone and occurred only 200 years ago.
The terrain in this area is very steep and covered by ice or snow for much of the year. It includes all of Mount Shasta's five glaciers. Because of the harsh climate at this elevation, little soil development has taken place and vegetation cover is very sparse, most of the area is completely barren. Those species that do grow are stunted and misshapen whitebark pine with some Shasta red fir and mountain hemlock. The only understory shrub is pinemat manazanita. Above treeline Mount Shasta is mostly unvegetated. Scattered, wind-blasted whitebark pine can be found up to about 9000 feet in elevation.
The most prominent feature in this map is the summit, visible for over 100 miles.
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