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Varves The Rockies and the Appalachians The Flood and the Strata The Last Ice Age Salt Deposits and the Flood Salt Domes Carboniferous Coal Measures Setterfield: Yes! What has happened was that the strata of the Himalayas was laid down under water in the period from the Cambrian (about 540 million atomic years) to the Cretaceous (ending about 65 million atomic years ago).Shortly afterwards, the Indian plate collided with the Eurasian plate.Fossils may also consist of the marks left behind by the organism while it was alive, such as animal tracks or feces (coprolites).These types of fossil are called trace fossils (or ichnofossils), as opposed to body fossils.The study of fossils across geological time, how they were formed, and the evolutionary relationships between taxa (phylogeny) are some of the most important functions of the science of paleontology.Such a preserved specimen is called a "fossil" if it is older than some minimum age, most often the arbitrary date of 10,000 years.In the early 1960s new data from ocean exploration led to the idea of seafloor spreading.

The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of the various strata and thereby the included fossils.The goal of this lecture is come to come to a scientific understanding of geologic time and the age of the Earth.In order to do so we will have to understand the following: To better understand these concepts, let's look at an archeological example: Imagine we are a group of archeologists studying two different trash pits recently discovered on the Tulane University campus and at the Audubon Zoo (where they all aksed for you).In the early days the rise would have been very much faster and then slowed as the two plates interacted with each other.The catastrophe of the Peleg continental division began about 3050 BC.Like extant organisms, fossils vary in size from microscopic, even single bacterial cells one micrometer in diameter, to gigantic, such as dinosaurs and trees many meters long and weighing many tons.