Argumentative Essay: How Are Fossils Made?

The author and his colleagues specifically chose to focus on 375 million year old rocks in their search for fossils because this was the time frame that provided fish that would be useful to study from. The 385 million year old rocks provided fish that look too similar to the ones we have now and the 365 million year old rocks have fossils that don’t resemble fish. The 375 million year old rocks, however, provide fossils that show the transition between fish and land living animals.

In order to find evidence of the transition from fish to land animals, the author and his colleagues chose to focus on 375 million year old rocks. In 2004, they studied sedimentary rock on Ellesmere Island in Canada’s Arctic as they thought that the rocks there would be exposed and untouched by humans, which would be ideal for fossil excavations. They studied sedimentary rocks (limestone, sandstone, siltstone and shales) because these

1. The author chose to focus on 375 million year old rock because the transition from fins to necks and limbs occurred then. The scientists knew that any time later than this and they would find lots of animals with limbs. But if they searched earlier than this time then there are only fish without necks. When the fish were evolving they evolved necks before they evolved limbs so this was a good sign in chronology. Sedimentary rocks are the best types of rocks for fossil due to their gradual pressure and low amounts of heat. Sedimentary rock is also found in lake beds and streams, where fish and aquatic wildlife are most likely to live.

Second, the author thinks that business in selling the fossils, reduce the access of scientists to these fossils as a great source of scientific evidence, but the professor explains that all fossils need scientific evaluation by scientists for price marking, so all fossils are

The author and his colleagues chose to focus on 375 million year old rocks in their search for fossils because amphibians that look dissimilar to fish were discovered in 365 million year old rocks, while fish without amphibian characteristics were discovered in 385 million year old rocks. Thus, it is possible that the evolutionary intermediary, or the “missing link” between fish and amphibians, would be discovered in 375 million year old rocks, between the two time periods. The rocks examined were sedimentary in composition, as the gradual and relatively gentle formation of sedimentary rock under conditions of mild pressure and low heat are conducive to the fossilization of animal remains. Sedimentary rock is also often formed in rivers and seas, where animals are likely to live. This site provides a resource that describes means by which fossils are formed and how the fossil record may be interpreted, and shows some examples of fossils demonstrating evolution through geological periods: http://www.fossilmuseum.net/fossilrecord.htm. In 2004, Shubin and his colleagues were looking for fossils on Ellesmere Island, in northern Canada. This location was chosen because of its lack of human development, as well as of obstructing natural formations and life forms such as trees, which

Fossils grant us opportunity of understanding about species which no longer exist on Earth- that are extinct. The prehistoric remains inform us about plants and

Fossil preservation has always been the most accurate way to determine what species lived during a specific time period. Through correlations and radiometric dating, time periods

Fossil evidence is very important for our understanding of plate tectonics theory. Similar animal fossils have been found on the South American and African continents. These fossils suggest that the continents were once joined together. Fossils of an extinct reptile, named a Mesosaurus, have been found in southern Africa and South America. Scientists believe that the only explanation for this fossil being found on these two continents is that they were once joined and have become separated due to plate movements. Plant fossils, such as a fossil of the Glossopteris tree have been found in several countries across the Southern Hemisphere such as India, Australia and even Antarctica. The discovery of these fossils prompted scientists to conclude that these countries must once have been joined in one large land mass. The discovery of such fossils as this in Antarctica gives additional weight to this theory as vegetation cannot survive the harsh Antarctic environment suggesting that if vegetation has been able to grow previously, the positioning of the continent must have been

There are a lot of factors, from the stomachs of predators, scavengers, feeders, even making it to fossilization and then somehow finding its way back to the surface through geological forcers and discovered a million years later.

There is a common misconception that fossil fuels come from dead dinosaurs, and while this is not actually true, fossil fuels do come from dead plans and animals, however they were dead long before the dinosaurs roamed the earth (U.S. Department of Energy). The type of animal and plant, as well as the varied combinations these could create, determine the type of fossil fuel that was formed (U.S. Department of Energy): oil, natural gas, or coal. The EIA defines fossil fuels as “concentrated organic compounds found in the Earth’s crust” (Fossil Fuels). This means that fossil fuels are formed when

There is a common misconception that fossil fuels come from dead dinosaurs, and while this is not actually true, fossil fuels do come from dead plans and animals, however they were dead long before the dinosaurs roamed the earth (U.S. Department of Energy). The type of animal and plant, as well as the varied combinations these could create, determine the type of fossil fuel that was formed (U.S. Department of Energy): oil, natural gas, or coal. The EIA defines fossil fuels as “concentrated organic compounds found in the Earth’s crust” (Fossil Fuels). This means that fossil fuels are formed when

: Fossils are the remains or traces of ancient organisms which have been preserved. For example, a fossil can exist as skeletal remains or even as a footprint. Such organisms are subjected to a slow rate of decaying since they have been rapidly buried under conditions that facilitate this. It is common for fossils to occur as hard-bodied organisms as these are more resistant to environmental influences. Fossils are usually found embedded in rock. The layers of rock are of different age and makeup. Hence fossils found in one layer would vary in characteristics from those found in another layer. They can be observed and analyzed through visual as well as radiometric means so that the age and morphology can be determined. These features indicate

These techniques led to the discovery of the boundary between the two eras. A single thin layer of clay found within predominantly limestone rocks established this. By comparing the marine life found in, above, and below the clay, the marine life, like the dinosaurs, had been terribly affected by the extinction event. The percentage of life in the upper layers was dramatically lower than that in the lower. This was far more compelling than what was suggested by dinosaur’s fossils.

In the science of paleontology, the history of life is studied. Paleontologists study fossils to learn the past ecologies, evolution, and the origins of humans. In order to understand the processes that have led to both the origination and destruction of organisms since life began, paleontologists incorporate both scientific knowledge and studies. Fossil findings are critically important for confirming predictions of evolution theory. Of the many discoveries that are made yearly to add depth to the understanding of evolution, an example is a recent discovery of a creature they named Tiktaalik. The Tiktaalik was uncovered to be a transitional animal between shallow-water fishes and limbed animals. The creature supports the idea that it emerged from both mammals and reptiles, suggesting that the two are related. These findings support prediction of evolution, contradicting the belief that God

The fossil record is evidence of evolution. Fossils are often fingerprints of evolution. They help scientists track how species evolved