Dating petrified wood
She is an active Muay Thai kickboxer at Five Points Academy and loves exploring NYC with friends.FOREWORD Very few things capture one's imagination quicker than finding a fossil while on a nature walk or even a walk through a museum. He has been responsible for introducing numerous other investigators to the "intrigue" of the forest, always seeking, always asking, never leaving one stone left unturned, if that stone might help answer the questions of the "Fossil Forest." Dr.Well-known as the most precise dating method, dendrochronology enables us to study different aspects of the past with annual, and sometimes seasonal, precision over time.Of the numerous definitions describing the essence of dendrochronology, here at the Cornell Tree-Ring Laboratory, we adhere to Eckstein's definition: "dendrochronology is a science of extracting chronological and non-chronological information from dated tree-rings." The key to dendrochronology and related sciences is tree-ring growth.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. Harold Coffin's lifelong quest for answers concerning not just one fossil but literally a whole "forest" of fossils, the fossil forests of Yellowstone National Park (YNP). Coffin has pioneered research into the various fossil areas of YNP looking for clues that would help him unravel the questions of origins for these magnificent fossil trees.As the wood's organic tissues slowly break down, the resulting voids in the tree are filled with minerals such as silica — the stuff of rocks.Over millions of years, these minerals crystallize within the wood's cellular structure forming the stone-like material known as petrified wood.
Other fossil forests in the northeastern part of the park are found in the Cache Creek Area, and on both sides of Soda Butte Creek and the Lamar Valley.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.These fossilised trees are said to be at least 20 meters tall, dating to the same period from which Nalut's dinosaur fossils date - between 90 and 95 million years ago.
A third site is also found in North Central Libya, near As-Sahabi River site, also rich in fossils of past Saharan life.Michelle writes about technology and chemistry for Live Science.