Geological Time & Age Dating

Geology Elsherouk library

1 | P a g e

Geological Time

Age Dating

● Geologic time can be measured in two ways:

Relative dating places events in a sequential order

as determined from their positions in the geologic

record.

Relative Dating Method) طريقة العمر النسبي

Geology Elsherouk library

2 | P a g e

Absolute dating provides specific dates for

rock units or events expressed in years before

the present. Radiometric dating is the most

common method of this method.

.

Geology Elsherouk library

3 | P a g e

Geology Elsherouk library

4 | P a g e

●

●

Geology Elsherouk library

5 | P a g e

Geology Elsherouk library

6 | P a g e

Geology Elsherouk library

7 | P a g e

Geology Elsherouk library

8 | P a g e

Unconformity

An unconformity is a surface of erosion,

nondeposition, or both separating younger

rocks from older rocks. These surfaces

encompass long periods of geologic time for

which we have no geologic record at that

location.

Geology Elsherouk library

9 | P a g e

Relative Age Dating

The principles of relative dating can be

applied in deciphering the geologic history

of an area.

Correlation

Correlation is the process by which geologists match up

rock units in different areas by showing time equivalency.

Surface exposures can be correlated by using similarity

of rock type, position in a sequence, key beds, and fossil

assemblages as well as tracing units laterally.

Geology Elsherouk library

10 | P a g e

Geology Elsherouk library

11 | P a g e

Geology Elsherouk library

12 | P a g e

Geology Elsherouk library

13 | P a g e

Geology Elsherouk library

14 | P a g e