« previous next »

Author Question: How were absolute ages added to the geologic time scale in the 20th century? What will be an ideal ... (Read 52 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?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Although average brain size increases gradually though time in H. erectus, individuals with small br Although average brain size increases gradually though time in H. erectus, individuals with small br
This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev
Americans Ages 20-24 Who Have Married Americans Ages 20-24 Who Have Married
Milankovitch cycles interact over time Milankovitch cycles interact over time
Weak bones cause the spine to collapse over time Weak bones cause the spine to collapse over time
The frequency of aneuploidy changes dramatically over developmental time. Between 6 to 8 weeks and 2 The frequency of aneuploidy changes dramatically over developmental time. Between 6 to 8 weeks and 2
Video: Stroke volume - afterload definition & hypertension

For a complete list of videos, visit our video library