引用红木国家公园的标志:
红木曾经覆盖了世界的大片地区。数百万年前，这些红杉中的一些被火山灰掩埋后被保存下来，成为树木的化石。随着时间的推移，树木从灰烬中吸收二氧化硅，形成一个石头复制品。曾经有生命组织的地方，现在有了岩石。< / p >
In North America, redwood fossils have been found in Texas, Pennsylvania, Colorado, Wyoming, Oregon, Washington, California, Canada, Greenland, Alaska, and St. Lawrence Island. In Europe, fossils of redwoods have been found in France, Switzerland, Austria, Bohemia, Germany, England, and Spitzbergen. You can see fossil redwoods for yourself by visiting Yellowstone National Park in Wyoming, Florissant Fossil Beds National Monument in Colorado, or The Petrified Forest in Calistoga, California
The height of S. sempervirens is closely tied to fog availability; taller trees become less frequent as fog becomes less frequent. As S. sempervirens' height increases, transporting water via water potential to the leaves becomes increasingly difficult due to gravity
If you put those two facts together than it seems like either (1) the vast majority of the redwoods that existed millions of years ago fell short of their full potential height or (2) the Earth, millions of years ago, was a lot more foggy than it is today?
If the latter than why would the Earth have been so much foggier?