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A geological history of the earth by the author of T. Rex and the Crater of Doom returns readers to the site of his team's landmark discovery about the asteroid that killed the dinosaurs, in an account that traces the stories of such planetary features as the Seven Hills of Rome, the limestone Apennine mountains, and the Mediterranean Sea.
One of the world's leading geologists takes readers into Italy's Apennine Mountain Range—the Mountains of Saint Francis—on a journey to discover the fascinating secrets of the Earth's deep history. Modern geologists, Walter Alvarez among them, showed in the last decades of the twentieth century that the history of our planet has witnessed events profoundly more dramatic than even the most spectacular chapters in human history. More violent than wars, more life altering than revolutions—understanding the geologic events that have shaped the Earth's surface is the quest and the passion of geologists. In the knowledgeable and graceful prose of Alvarez, general readers are led to explore the many mysteries that our planet guards. The author has chosen Italy as a microcosm in which to explore this amazing past for several reasons. First, it is the land where the earliest geologists learned how to read the history of the Earth, written in nature’s rock archives. Second, it is where Alvarez and his Italian geological friends have continued to decipher the rock record, uncovering more historical episodes from the Earth’s past. And third, the lovely land of Italy is unusually rich in geological treasures and offers examples of the key processes that have created the landscapes of the entire world. The Mountains of Saint Francis begins in Rome. We discover that the landscape of Rome was built by violent volcanic eruptions in the very recent past, almost certainly witnessed by our human ancestors. Next we travel to Siena and come face to face with a fundamental discovery of the geologists—that much of the dry land that we currently inhabit was once underwater, beneath ancient seas or oceans. Then we stop in the small medieval city of Gubbio and contemplate the amazing secret that the limestone rocks kept hidden for 65 million years—that a huge asteroid smashed into the Earth, disrupting the environment so severely that the dinosaurs, and perhaps half of the other forms of life inhabiting the Earth at the time, disappeared forever, opening the way for the rise of the mammals and eventually of humans. The impact theory that came from those Italian limestones at Gubbio was one of the great geological discoveries of the twentieth century. Just as important to the field of geology was the theory of plate tectonics—the understanding that the outer layer of the Earth is divided into crustal plates that move around, sometimes carrying continents into collisions with one another, like the great collision between Italy and Europe that built the Alps. And yet, to explain the Mountains of Saint Francis requires something more than a collision between continents. These are mountains that are still jealously guarding the secret of their past, and in this book we go along with the geological detectives as they try to uncover that secret. It is a journey that has seen the land of Italy lifted out of the sea, squashed and folded, torn apart, left high and dry when the Mediterranean Sea evaporated away, and then flooded when the Atlantic waters poured back in. The story of the Earth's history is fascinating in its own right, but with Alvarez as the tour guide, the journey takes on a human dimension, full of stories about the landscape and history of Italy and about the great geologists who uncovered the deep past of this land. It is a journey recounted in warm tones and subtle colors, reflecting the transcendent beauty of Italy itself.
Since the beginning of the last century, the lower Jurassic to mid-Miocene pelagic succession exposed along the valleys of the Umbria and Marche Apennines of Italy represented a fertile playground for generations of earth scientists. This GSA Special Paper provides a reappraisal of the geological and integrated stratigraphic research, which was carried out by scores of earth scientists in the gorges around the medieval city of Gubbio over the past fifty years. Following review chapters about pioneering sedimentologic, biostratigraphic, and magnetostratigraphic studies of the Gubbio sections, a series of papers presents new, original data addressing different stratigraphical, paleoenvironmental, and structural geological aspects of particular Cretaceous to Paleogene intervals, including the still much-debated K-Pg Boundary Event in the worldwide famous site of the Bottaccione Gorge, where the Alvarez theory of global mass extinction caused by a catastrophic extraterrestrial impact was born in 1980.
Undertaking a peripatetic pilgrimage that is equal parts a daily description of a 200-kilometre walk from the wounded mountain of La Verna to the tortured river in Assisi, and an examination of the debt owed to Italy in terms of ecocultural and environmental scholarship, this book provides an innovative addition to the nascent field of ecocritical narrative scholarship. Through a process that has been referred to as “deep-travel“ or “mind-walking,” the text fulsomely reviews how time spent in Italy influenced the writings of notable North American environmental historians, geographers, scientists, nature writers, landscape architects, and restoration theorists about the conception and manipulation of the natural world. This literary field study highlights how the phenomenological co-traversing of texts and trails can be a valued methodology for undertaking environmental criticism.
This book offers a vision of how evolutionary life processes can be modelled. It presents a mathematical description that can be used not only for the full evolution of life on Earth from RNA to modern human societies, but also the possible evolution of life on exoplanets, thus leading to SETI, the current Search for ExtraTerrestrial Intelligence. The main premise underlying this mathematical theory is that the Geometric Brownian Motion (GBM) can be applied as a key stochastic process to model the evolution of life. In the resulting Evo-SETI Theory, the life of any living thing (a cell, an animal, a human, a civilization of humans, or even an ET civilization) is represented by a b-lognormal, i.e., a lognormal probability density function starting at a precise instant (b, birth) then increasing up to a peak time, then decreasing to senility time and then continuing as a straight line down to the time of death. Using this theory, Claudio Maccone arrives at remarkable hypotheses on the development of life and civilizations, the possibility of extraterrestrial life, and when computers will take over the reins from us humans (Singularity). The book develops the mathematical Evo-SETI Theory by integrating a set of articles that the author has published in various journals on Astrobiology and Astronautical Research.
The web of geological sciences, Special papers 500 and 523, written in celebration of the 125th anniversary of the Geological Society of America.
"A thrilling synthesis from a brilliant scientist who discovered one of the most important chapters in our history." —Sean B. Carroll Big History, the field that integrates traditional historical scholarship with scientific insights to study the full sweep of our universe, has so far been the domain of historians. Famed geologist Walter Alvarez—best known for the “Impact Theory” explaining dinosaur extinction—has instead championed a science-first approach to Big History. Here he wields his unique expertise to give us a new appreciation for the incredible occurrences—from the Big Bang to the formation of supercontinents, the dawn of the Bronze Age, and beyond—that have led to our improbable place in the universe.
Sixty-five million years ago, a comet or asteroid larger than Mount Everest slammed into the Earth, inducing an explosion equivalent to the detonation of a hundred million hydrogen bombs. Vaporized detritus blasted through the atmosphere upon impact, falling back to Earth around the globe. Disastrous environmental consequences ensued: a giant tsunami, continent-scale wildfires, darkness, and cold, followed by sweltering greenhouse heat. When conditions returned to normal, half the plant and animal genera on Earth had perished. This horrific chain of events is now widely accepted as the solution to a great scientific mystery: what caused the extinction of the dinosaurs? Walter Alvarez, one of the Berkeley scientists who discovered evidence of the impact, tells the story behind the development of the initially controversial theory. It is a saga of high adventure in remote locations, of arduous data collection and intellectual struggle, of long periods of frustration ended by sudden breakthroughs, of friendships made and lost, and of the exhilaration of discovery that forever altered our understanding of Earth's geological history.