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Depending on the layers. For a certain amount of years there is a certain amount of layers. So, if a fossil is found on a certain layer then you can figure out how old it is.
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What is the evidence of seafloor spreading?
Animal fossils have been found in many places in the ocean.
How did fossils provide evidence for contental drift?
Because, similar fossils could be found on different continents, in rocks of the same age.
What are index fossils and how are they used to determine the absolute age of sedimentary rocks?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
How did seafloor spreading help prove continental drift was true?
Evidence for continental drift is now extensive. Similar plant and animal fossils are found around different continent shores, suggesting that they were once joined. The fossils of the freshwater crocodile, found both in Brazil and South Africa, are one example; another is the discovery of fossils of the aquatic reptile Lystrosaurus from rocks of the same age from locations in South America, Africa, and Antarctica. There is also living evidence --- the same animals being found on two continents. An example of this is a particular earthworm found in South America and South Africa. The complementary arrangement of the facing sides of South America and Africa is obvious, but is a temporary coincidence. In millions of years, seafloor spreading, continental drift, and other forces of tectonophysics will further separate and rotate those two continents. It was this temporary feature which inspired Wegener to study what he defined as continental drift, although he did not live to see his hypothesis become generally accepted. It's generally saying that fossils have been found on landmasses far away from each other but because of seafloor spreading the continents could have once been connected.
What do scientists use to date exact age of fossils?
For relatively recent fossils, dating by carbon 14 is the most accurate method. For older fossils it is necessary to analyse the geological layer in which they are found; fossils located in an undisturbed geological layer of a certain age, are the same age as the layer in which they are found, necessarily.
What is the evidence of seafloor spreading?
Animal fossils have been found in many places in the ocean.
Are dinosaur fossils ever found on the north pole?
No. Under the north pole is seafloor. Dinosaurs were land-dwellers
What is the age of fossils that can be measured by what dating?
Fossils themselves can very rarely be dated by any means...their age is usually judged by the geological assessment of the area and layer in which they are found
Why do scientist use radioisotopes to find the age of fossils?
Radiometric dating of fossils is not possible beyond roughly 70,000 years. However, when fossils are found in association with strata of volcanic and metamorphic rocks which can be dated radiometrically, a very accurate age of the fossils can be determined.
What is the age of fossils found in west Serengeti Tanzania?
5,000,000,000,000 years old
How did fossils provide evidence for contental drift?
Because, similar fossils could be found on different continents, in rocks of the same age.
What are index fossils and how are they used to determine the absolute age of sedimentary rock?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
What are index fossils and how are they used to determine the absolute age of sedimentary rocks?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
How does the age of rocks in the seafloor provide evidence of seafloor spreading?
Rocks in the seafloor are moving one place to another
How does the age of seafloor sediments change with increasing distance from the ocean ridge?
Age of seafloor rock and sediment increases with distance from the oceanic ridges.
How can the age of a rock be related to fossils?
If a lava flow or bed of volcanic ash was dated using isotopic dating methods and fossils were found in a sedimentary rock beneath the volcanic rock, it can be surmised that the fossils were older than the lava or ash. If the same species of fossils were found in another part of the world it would make sense that the rocks there were the same age as previous fossils. By cross checking with many other areas with other volcanic rocks, it can be found that all the rocks around the world containing those fossils were of a similar age.
Give two pieces of evidence for seafloor spreading?
Geographic similarities between continental margins on both sides of the Atlantic Ocean and similarity of strata and fossils found on those margins.
