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Alder and willow typically colonise floodplain deposits that are permafrost free. Tombstone Territorial Park, Yukon.
Mt Monolith and willow thickets. Tombstone Territorial Park, Yukon.
Mt Tombstone looms high above the tundra. Yukon.
Mt Tombstone. Tombstone Territorial Park, Yukon.
A snow storm sweeps across the Tombstone Range. Ogilvie Mountains, Yukon.
Salmon Glacier. Northern British Columbia.
Sunwapta River. Jasper National Park, Alberta.
White-tailed ptarmigans. Ogilvie Mountains, Yukon.
Final rays of evening light fall across the North Klondike River drainage. Tombstone Territorial Park, Yukon.
Scree deposited beneath a mountain pass. Over time the scree is reduced in size via chemical and physical weathering later becoming vegetated by moss and lichen. Ogilvie Mountains, Yukon.
Peaks of the Tombstone Range are prone to exfoliation of the syenite rock. Joints in the rock allow water to penetrate and freeze, incrementally levering out large slabs. Tombstone Territorial Park, Yukon.
The Tombstone Range looms high above the tundra, Ogilvie Mountains, Yukon.
The Tombstone Range is formed by syenite to quartz diorite intrusions. The intrusive rocks are frost-fractured along vertical rocks, resulting in sheer cirque walls and blocky scree. Ogilvie Mountains, Yukon.
Tundra vegetation in autumn detailing an intricately woven carpet of alpine bearberry and lichen. Tombstone Territorial Park, Yukon.
Ogilvie Mountains, Yukon.
Tombstone Mountain is within the western portion of the Mackenzie Mountains ecoregion, one of the largest and most diverse of the Yukon's ecoregions.
Mt Monolith casts an ominous presence over Divide Lake. Tombstone Territorial Park, Yukon
Scree deposits, Ogilvie Mountains, Yukon
Ogilvie Mountains, Yukon.
Autumn colours along the North Klondike River drainage. The red pigment found in the leaves and stems of many tundra plants convert incident rays into heat to warm plant tissues. Yukon.
Steep walls within the Tombstone Range result from exfoliation of syenite, Yukon.
Peaks of the Ogilvie Mountains dusted in snow following a brief storm reveal mountain scale folds and layering. Tombstone Territorial Park, Yukon.
Autumn colours. Ogilvie Mountains, Yukon.
Autumn colours along the North Klondike River Drainage. During autumn when anthocyanins (water soluble vacuolar pigments within plants) are not masked by chlorophyll, plants endure cold better than greener ones. Tombstone Territorial Park, Yukon.
Mt Tombstone and surrounding peaks after a snow storm. This range was formed from a series of granitic intrusions which penetrated into the overlaying sedimentary rock. Mechanical weathering later exposing the granitic faces, Tombstone Territorial Park, Yukon

All images Copyright © 2013 Michael Polychronopoulos Photography