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Tree-rings are easy to observe in the cross-section of most sawn tree trunks.

Each ring is one of the many concentric bands surrounding the pith and all are more or less distinguishable from each other.

There is an almost mystical drawing power associated with fossils. Coffin's quest for answers has taken him from the tops of high mountains, to encounters with grizzly bears, to walks into the destruction zone of Mount Saint Helens.

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In Greek mythology, merely glancing at the ugly head of Medusa could turn the looker into stone. Petrified wood forms when fallen trees get washed down a river and buried under layers of mud, ash from volcanoes and other materials.Sealed beneath this muck deprives the rotting wood from oxygen — the necessary ingredient for decay.His drive for answers is equaled only by the prospector bitten by the gold bug or the diver searching for the lost Spanish galleon. Coffin's narrative on the Yellowstone Fossil Forest it is my wish that you will not only become enthralled with the Fossil Forest but that you will also recognize and appreciate the careful scientific work that has brought Dr. There is still a list of unanswered questions that continue to beckon researchers for answers.If you feel a desire for adventure, why not consider the intrigue of a fossil forest? INTRODUCTION The Petrified Forests of Yellowstone National Park in Wyoming and Montana are perhaps the most spectacular and extensive petrified forests in the world and have stimulated scientific investigations for over 100 years.Tree-rings are wider or narrower, brighter or darker and they reflect conditions under which the tree grew, mainly the climate conditions.

The ring widths, the anatomical characteristics of the wood, and other features of their growth vary from year to year with changing environmental conditions.

The forest can be reached via the road from Sabha to Awaynat, which is the tarmac road leading to Ghat from Sabha.

A petrified forest of giant trees was also discovered in an area west of Nalut, Nafousah Mountain.

Dendrochronology is a relatively young and dynamic branch of science based on the extensive record of the past environment and climate that is evident in the biological growth of trees.

These records include evidence for both cataclysmic events and patterns of climate change over time, both at local and regional levels.

They are the result of cell formation outwards from the pith (the oldest part of the tree).