The terminal 17 km. of the Martin River Glacier, and its periphery offer a unique insight into a dynamic system involving land forms, water, plants and animals, all of which are directly dependent upon the glacier regimen. Of the four zones, the Active Ice, Intermediate, Terminal, and Glaciated, the fist is the most extensive. The second two are characterized by forest and brush-covered superglacial drift, less than 1 m. to more than 3 m. in thickness. Ice sinkhole depressions and lakes are common and may drain suddenly via englacial and subglacial channels. Occasional clear lakes are present in the Terminal Zone where ice may lie beneath only 1 to 2 m. of superglacial drift, which is sufficient to protect the lake water from the cold ice and allow successful propagation of aquatic fauna. Trees in the Terminal Zone indicate that this zone was glacially active about A.D. 1650. The outermost terminal moraine and the numerous moraine segments in the Glaciated Zone are probably of Late Wisconsin age. These can be traced to the upper 14 lateral moraines in the valley of the Charlotte Lobe. The soils in the lower 7 moraines are immature to azonal and are probably of Neoglacial age. RÉSUMÉ. Géomorphologie et géologie glaciaire du glacier de la rivière Martin, Alaska.Les derniers 17 km du glacier de la rivière Martin et leur voisinage offrent un aperçu unique sur un système dynamique groupant formes de terrain, eau, plantes et animaux, tous dépendants du régime du glacier. Des quatre zones: zone de glace active, zone intermédiaire, zone terminale et zone glaciée, la première est la plus &endue. Les deux suivantes se caractérisent par de la moraine de surface, d'une épaisseur variant de moins d'un mètre à plus de 3 mètres, couverte de foret et de broussailles. Lacs et dépressions de fonte sont communs et plusieurs se drainent soudainement par des chenaux "englaciaires" et sous-glaciaires. Quelques lacs sont présents dans la zone terminale oil la glace se trouve sous de 1 2 m seulement de moraine de surface, ce qui est suffisant pour protéger les eaux lacustres de la glace et permettre la propagation de la faune aquatique. Les arbres de la zone terminale indiquent que cette zone était glaciairement active vers l'an 1650. La moraine terminale extérieure et les nombreux segments de moraine de la zone englacée sont probablement d'âge fini-wisconsinien. On peut les relier aux 14 moraines latérales supérieures de la vallée du lobe Charlotte. Les sols des 7 moraines inférieures vont de "l'immature" à "l'azonal'' et sont probablement d'âge néo-glaciaire. GEOMORPHOLOGY AND GLACIAL GEOLOGY FIG. 2. Average annual precipitation and temperature for Cordova, Alaska, since 1920.
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