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  • Tropical Fossils in Alaska | Geophysical Institute
    Paleobotanist Jack A Wolfe of the United States Geological Survey at Menlo Park, California, has found a number of tropical rain forest fossils along the eastern Gulf of Alaska These include several kinds of palms, Burmese lacquer trees, mangroves and trees of the type that now produce nutmeg and Macassar oil
  • Cottonwood and Balsam Poplar | Geophysical Institute
    The Klukwan giant belies the belief that trees tend to get smaller the farther north one goes Both balsam poplar and cottonwood have value for fuel wood, pulp and lumber
  • Northern Tree Habitats | Geophysical Institute
    Why take a chance with exotics, when native trees have proven their ability to survive? Several reasons prompt testing of foreign tree species Human activities often create and maintain new, sometimes artificial habitats that native trees are not adapted to Exotics may have strong wood, large fruits or straight boles that are lacking in the
  • Trees as Earthquake Fault Indicators - Geophysical Institute
    Sagging or tilting of the ground along a fault trace causes trees there to tilt or even fall If these trees continue to grow, their new annual rings show an extreme asymmetry--the rings on the down-tilted side of the tree are much wider than on the up side This difference leaves a record that can be read by making multiple core drillings around the tree Then using tree ring dating methods
  • Black Spruce | Geophysical Institute
    Somehow black spruce trees seem like the jackasses of the northern forests--sort of ungainly looking, ugly little beasts that somehow can survive under conditions prohibitive to the taller and more elegant birches and white spruce But, like donkeys, black spruce have their likable and interesting qualities
  • The Kodiak Treeline | Geophysical Institute
    Spruce trees planted on the islands by the Russians in 1805 are doing just fine and reseeding themselves naturally, although the total tree population hardly amounts to a forest
  • The largest black spruce in Alaska | Geophysical Institute
    The Alaska champion black spruce tree stands on the campus of the University of Alaska Fairbanks The tree lives in a mixed forest next to large white spruce trees, mature birch and a few alders and willows The tree leans uphill, and its trunk is 45 inches around When I hugged it, I could barely clasp my hands together
  • Burls - Geophysical Institute
    Burls weaken trees but do not kill them The weakening effect, however, makes the trees vulnerable to other diseases which can kill them Relatively little is known about burls, for several reasons: It takes a long time for a burl to grow--nearly as long as the tree on which it is found--so research is stretched out over a long period of time
  • More on Why Tree Trunks Spiral | Geophysical Institute
    Granted, not all trees exhibit the same twist, but the majority of them do The phenomenon can be likened to the claim that water will always spiral out of a drain in a counter-clockwise direction in the northern hemisphere
  • Feltleaf willows: Alaska’s most abundant tree | Geophysical Institute
    The range of the feltleaf willow, probably the most numerous tree in Alaska From Alaska Trees and Shrubs by Les Viereck and Elbert L Little, Jr





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