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Thus, the climate may have been more equable than it is now.2.0"h; 66 gm What Happened to the Mega Fauna and the Paleo-Indian? A geological black-layer deposit of carbon containing nano-diamonds at over 50 locations in North America tells the tale: About 12,900 years ago a huge Ice Age comet hit the atmosphere just above Canada.The discoverer, Geologist James Kennett, also found an abnormally high percentage of these nano-diamonds in a Greenland Glacier at the 12,900-year layer.This spruce forest lasted for about 1,000 years, until about 15,000 years ago, when climate warmed and deciduous trees became more abundant, including balsam poplar (Populus balsamifera), black ash (Fraxinus nigra), and ironwood (Ostrya virginiana or Carpinus caroliniana).
Balsam fir (Abies balsamea) also was present, as was spruce, although not as abundantly as before.
Both white spruce (Picea glauca) and black spruce (Picea mariana) were present, as was larch (Larix laricina).