« previous next »

Author Question: How were absolute ages added to the geologic time scale in the 20th century? What will be an ideal ... (Read 80 times)

tsand2

  • Hero Member
  • *****
  • Posts: 520
on: Jul 15, 2018
How were absolute ages added to the geologic time scale in the 20th century? What will be an ideal response?

Question 2

How was the geologic time scale developed in the 19th century? What will be an ideal response?


stallen

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 15, 2018
Answer to Question 1

Thousands of absolute ages were added to the relative time scale that had been created. Since
sedimentary rocks cannot be radiometrically dated, interbedded volcanic rocks and igneous intrusions
that could be dated provided boundaries of the subdivisions of the geologic time scale.



Answer to Question 2

Geologists applied relative-dating methods to rock outcrops in England and western Europe, and they
put together the major geologic time units. They made a composite geologic section, using the
principles of superposition and fossil succession. The rocks are in sequential order, but there are no
absolute ages.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

There are more bacteria in your mouth than there are people in the world.

Milking reindeer in the 19th century Milking reindeer in the 19th century
Harriet Beecher Stowe’s novel, Uncle Tom’s Cabin, became a staple of the mid-nineteenth-century thea Harriet Beecher Stowe’s novel, Uncle Tom’s Cabin, became a staple of the mid-nineteenth-century thea
Cao Fei, RMB City, in Art in the Twenty-First Century, season 5 episode, "Fantasy". Cao Fei, RMB City, in Art in the Twenty-First Century, season 5 episode, "Fantasy".
Glasgow Coma Scale Glasgow Coma Scale
Dried fruits often have sulfur dioxide or other sulfites added to them to preserve color and flavor Dried fruits often have sulfur dioxide or other sulfites added to them to preserve color and flavor
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ... Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...
Video: Exercise and cardiac output

For a complete list of videos, visit our video library