Ways dating fossils

Geologists call this the principle of lateral continuity.A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.So, when looking at the history of a cliff face, it is important to read the story it tells from the bottom layer up. There are two main methods determining a fossils age, relative dating and absolute dating.But, how can we determine how old a rock formation is, if it hasn’t previously been dated?Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.Sometimes, scientists already know the age of the fossil because fossils of the same species have been found elsewhere and it has been possible to establish accurately from those when the dinosaur lived. This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly.As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.However, by itself a fossil has little meaning unless it is placed within some context.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.The majority of the time fossils are dated using relative dating techniques.Using relative dating the fossil is compared to something for which an age is already known.

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