How would a geologist use absolute dating to determine the age of sedimentary layers

how would a geologist use absolute dating to determine the age of sedimentary layers

How is the age of a sedimentary rock layer determined?

by dating the age of several radioactive elements in a sedimentary rock layer by dating the age of intrusions and extrusions near a sedimentary rock layer by comparing the relative ages of several sedimentary rock layers by identifying fossils in nearby intrusion and extrusions and determining their age

How would a geologist use absolute dating to determine the age?

How would a geologist use absolute dating to determine the age of sedimentary layers? A.by dating the age of several radioactive elements in a sedimentary rock layer Hope this helps! Did this page answer your question?

How do geologists determine the exact time when certain rocks appeared?

For the determination of the “exact” time when certain rocks appeared, it was the beginning of the 20 th century, i.e. the discovery of radioactivity that gave to the geologists a “clock” which helped them to define it. The determination of absolute (radiometric) age of a rock is based on the radioactive decay of isotopes.

How is the relative age of magmatic and metamorphic rocks determined?

Relative age of magmatic and metamorphic rocks is determined according to their relation with sedimentary rocks.

How to determine the age of sedimentary rocks?

In order to age determination of sedimentary rocks, we need to index fossil (the fossil which large scale geographic distribution and low time interval). Paleontologic data supports the index fossil of each group of paleo-organisms .

How is the relative age of magmatic and metamorphic rocks determined?

Relative age of magmatic and metamorphic rocks is determined according to their relation with sedimentary rocks.

What is the difference between absolute dating and sedimentary dating?

Absolute dating is necessary for knowing specific time e.g. by isotope K/Ar in mica, especially in the crystalline rock: igneous and metamorphic rock. On the other hand, the sedimentary rock (as I know) usually provide the time of formation by age range of fossil e.g. Upper Miocene - Piocene.

How old are fossils preserved in sedimentary rocks?

There are what we call fossils that are preserved in sedimentary rocks. Geologically there are certain ages where some species were abundant. Like the dinosaurs roamed the world during Jurassic period, say about 200 million years. Fossils like trilobites in a sedimentary rock puts its age close to 500 million years.

Using relative and radiometric dating methods, geologists are able to answer the question: how old is this fossil? This page has been archived and is no longer updated Dating Rocks and Fossils Using Geologic Methods

What is relative and absolute dating in geology?

How do geologists determine the age of a rock?

The age, or the chronology of geological creations and events is determined using relative and absolute age. In determining the relative age of a rock, the data from sedimentary rocks are generally used.

What does relative age mean in geology?

Relative age means age in comparison with other rocks, either younger or older. The relative ages of rocks are important for understanding Earth’s history. New rock layers are always deposited on top of existing rock layers.

Why are sedimentary rocks more useful in establishing the relative ages?

Why are sedimentary rocks more useful than metamorphic or igneous rocks in establishing the relative ages of rock? In this lesson, you read how scientists determine the relative ages of sedimentary rock layers. The law of superposition determines which rock layers are younger or older than others.

What is the difference between sedimentary and metamorphic?

A metamorphic rock, on the other hand, began as a rock—either a sedimentary, igneous, or even a different sort of metamorphic rock. Then, due to various conditions within the Earth, the existing rock was changed into a new kind of metamorphic rock.

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