What would fossil ages from the geologic timescale and an isotopic age on the granite tell us about the age of the unconformity?

What would fossil ages from the geologic timescale and an isotopic age on the granite tell us about the age of the unconformity? The unconformity is older than the age assigned to the fossils.

Which principle can be used to determine the relative age of an igneous intrusion called a dike?

Which principle can be used to determine the relative age of an igneous intrusion called a dike? Cross-cutting relations. – Principle 4 states that younger rocks or features can cut across any older rock or feature.

What is a principle we use to determine the age of a landscape surface?

what is the principle we use to determine the age of a landscape surface? a surface wit ha well-developed soil is probably older than a surface with no soil. in this photograph, Paleozoic sandstone rests depositionally on Precambrian granite.

What defines the boundaries between each of the three eras in the geologic timescale?

Mass extinctions mark boundaries between eras. On the Geologic Time Scale, "Era" are subdivided into Periods; example: Mesozoic Era is subdivided into the Triassic, Jurassic and Cretaceous Periods.

Which of the following types of data could be used by geologists to estimate the age of past Earth events?

The age of rocks is determined by radiometric dating, which looks at the proportion of two different isotopes in a sample. Radioactive isotopes break down in a predictable amount of time, enabling geologists to determine the age of a sample using equipment like this thermal ionization mass spectrometer.

Which of the following are principles used to determine the relative ages of geologic events?

Describe the principles that allow us to determine the relative ages of geologic events. The geologic history of a region can be determined by using principles such as uniformitarianism, superposition, original horizontality, original continuity, cross-cutting relations, inclusions, and baked contacts.

How do isotopes help in determining the exact numerical age of rocks?

Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element. These rates of decay are known, so if you can measure the proportion of parent and daughter isotopes in rocks now, you can calculate when the rocks were formed.

How would you describe the process of determining the relative age of the different layers?

First and foremost, they use the law of superposition to determine the relative ages of sedimentary rock layers. According to the law of superposition, in horizontal sedimentary rock layers the oldest is at the bottom. Each higher layer is younger than the layer below it.

What is a principle we use to determine the age of a landscape surface quizlet?

What is a principle we use to determine the age of a landscape surface? A surface with a well-developed soil is probably older than a surface with no soil.

Why are some units of the geologic time scale longer and some shorter?

Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is because geologic time is divided using significant events in the history of the Earth.

How will you differentiate eons eras periods and epochs in the geologic time scale?

To make geologic time easier to comprehend, geologists divided the 4.6 billion years of Earth's history into units of time called eons. Then they further divided the eons into two or more eras, eras into two or more periods, periods into two or more epochs, and epochs into two or more ages.

Which of the following types of data could be used by geologists to estimate the age of past Earth events and help determine that Earth’s history is not short?

Which of the following types of data could be used by geologists to estimate the age of past Earth events? You can use both superposition and contact effects to determine that the light-colored volcanic rock is younger than the underlying unit. Choose the rock types that might exist immediately below a nonconformity.

What are the parent and daughter isotopes used to determine the age of Earth?

RADIOMETRIC TIME SCALE

Parent Isotope	Stable Daughter Product	Currently Accepted Half-Life Values
Thorium-232	Lead-208	14.0 billion years
Rubidium-87	Strontium-87	48.8 billion years
Potassium-40	Argon-40	1.25 billion years
Samarium-147	Neodymium-143	106 billion years

•Jun 13, 2001

What methods do geologists use to determine the age of rocks describe them briefly?

How are isotopes used in geology?

Isotope analysis is also an important exploration tool, since it allows the determination of the origin of rocks and mineral deposits. In research on marine geological processes scientists apply the strontium isotope method to date marine sediments.

What method is used to determine the age of the rocks?

radiometric dating The age of rocks is determined by radiometric dating, which looks at the proportion of two different isotopes in a sample. Radioactive isotopes break down in a predictable amount of time, enabling geologists to determine the age of a sample using equipment like this thermal ionization mass spectrometer.

Which of the following are other ways to determine the relative ages of rock layers?

Geologists use the law of superposition to determine the relative ages of sedimentary rock layers. According to the law of superposition, in horizontal sedimentary rock layers the oldest layer is at the bottom. Each higher layer is younger than the layers below it.

How does the character of a rock influence weathering?

How does the character of a rock influence weathering? Rocks that are broken have more surface area and so weather faster. slower rate of soil formation and less soil.

What is meant by geological time scale Why is it necessary to determine the age of fossils?

Solution : Geological Time Scale is the table showing the sequence and duration of eras, and their periods and epochs with their dominant forms of life since the beginning of life on the earth. It proves gradual complexity of life and even extinction of a number of species.

How is the geologic time scale subdivided into smaller units?

This geological timeline is subdivided into a range of geochronological units which in turn are subdivided in decreasing order of scale from Eons (the largest subdivision of geological time), Eras, Periods, Epochs, and finally to the smallest subdivision of time called Ages.

How the geologic time scale was created and how it is divided?

In the Geologic Time Scale, time is generally divided on the basis of the earth's biotic composition, with the Phanerozoic Eon (i.e. the Paleozoic, Mesozoic and Cenozoic Eras) representing the period of Earth's history with advanced life forms, and the Pre Cambrian (or Proterozoic and Hadean Eras) representing the …

How can you use fossils and geologic features to interpret the relative ages of rock layers?

Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.

How do you find parent and daughter isotopes?

Radiometric Dating – Graphical Method For example, after one half-life 0.5 of the original parent isotope remains, 0.5 of the sample is now the daughter isotope. After two half-lives 0.25 of the original parent isotope remains, 0.75 of the sample is now the daughter isotope.

How can the age of a sample be determined from daughter and parent atoms?

How can the age of a sample be determined from a graph of daughter and parent atoms versus time? The ratio of daughter to parent atoms will show the age.

What are some of the ways to determine the relative ages of igneous rocks?

To determine the Relative Age of Rocks geologists use the Principles of Superposition, Cross-Cutting Relationships, and Index fossils. To determine the Absolute Age (exact age) of rock, geologists use Radiometric Dating.

What are the methods or ways in determining the age of stratified rock in relative time?

Methods to Determine the Age of Stratified Rocks

There are two methods of determining the ages of rocks: relative dating and absolute dating.
Relative dating is a method of arranging geological events based on the rock sequence.

What are isotopes in geography?

Most elements exist in two or more forms, known as isotopes. Isotopes have the same number of protons but differ in their number of neutrons, resulting in different masses. The lighter form is generally the more common one (Hobson & Wassenaar 2008).

How did you determine the age of the mineral that contains a particular radioactive isotope parent daughter pair?

Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope. At the next half-life there will be 25% of the radioactive isotope and 75% of the stable isotope.

What method is used in determining the age of rocks and fossils based on the diagram?

Cross dating is a method of using fossils to determine the relative age of a rock. Fossil remains have been found in rocks of all ages with the simplest of organisms being found in the oldest of rocks.

What can you infer about the age of the fossil and rock layer?

Scientists read the rock layers knowing that each layer is deposited on top of other layers. The law of superposition states that each rock layer is older than the one above it. So, the relative age of the rock or fossil in the rock or fossil in the rock is older if it is farther down in the rock layers.