Fossil correlation dating technique
This variation can occur vertically as layering (bedding), or laterally, and reflects changes in environments of deposition (known as facies change).These variations provide a lithostratigraphy or lithologic stratigraphy of the rock unit.
Some layers contain mostly fish fossils while others contain land-dwelling creatures such as dinosaurs.What is especially interesting is that the fossils do appear to show a progression from the most "simple" of organisms, such as single celled creatures like bacteria, to the most "complex" organisms, such as vertebrates, mammals, and of course humans.This evolutionary progression seems to be clearly demonstrated in that certain kinds of creatures in the upper layers are rarely if ever seen in lower layers.The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.Teaching about Earth's history is a challenge for all teachers.
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Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification).