Relative Dating of Rocks 

 Relative Dating of Rocks

Instructions/Descriptions

Lab Report on Relative Dating of Rocks Using Stratigraphic

Introduction and Goals: The goal of this lab is to study and apply relative dating principles to rocks, fossils, and geologic events. The history and concepts of stratigraphy will be addressed, as well as the use of fossils for relative dating. You’ll learn about the geologic timescale, how to calculate relative ages, and how geologists date events in Earth history using various approaches. You’ll also gain some hands-on experience with the principles and practices.

The Lab is available in the files below.

Laboratory for Physical Geology 111

Stratigraphic Principles for Relative Dating of Rocks

1. Introduction and Goals:

The goal of this lab is to learn about relative dating and how to apply it to rocks, fossils, and geologic events. The history and concepts of stratigraphy will be addressed, as well as the use of fossils for relative dating. You’ll learn about the geologic timescale, how to calculate relative ages, and how geologists date events in Earth history using various approaches. You’ll also gain some hands-on experience with the principles and practices.

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1. Becoming Familiar with the Six Principles of Stratigraphy:
2. Identify the seven basic physical stratigraphic laws:

Definition of the Stratigraphic Law

1) Superposition

3) Inclusion

4) Fossil Succession is a term that refers to the succession of fossils.

5) Continuity on the Sides

6) Horizontality that is unique

7) Unconformity B. Unconformities are gaps in the time-rock record when non-deposition and/or erosion occurred for a long length of time between deposition periods. They usually manifest themselves as visible uneven surfaces between two sets or groups of rock pieces, known as formations. Other geologic events such as tilting, folding, faulting, intrusion, and uplift can also be recorded by an unconformity. As a result, unconformities are useful for determining the age of rocks. The three types of stratigraphic unconformities are listed and defined as follows: Definition of the Unconformity Type

III. Using Stratigraphic Order to Determine Relative Ages of Rocks and Geologic Events Directions: Fill in the blanks with your study and appraisal of the two geologic cross-sections provided below. Do the following for each geologic cross-section:

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1. Calculate the ages of the rock bodies and other geologic features/events such as tilting, uplift, faulting, and erosional unconformities.
3. In the column of blanks, write down the letters from oldest (bottom of the list) to youngest (top of the list) in chronological order the sequence of geologic events (each one is identified with a letter). You must also specify which stratigraphic legislation was utilized to place each dated event in its relevant time frame for each dated event. The stratigraphic rules are abbreviated as SP = superposition, IN = inclusions, CC = cross-cutting, and UN = unconformity.
4. Identify and label any lettered unconformities in each cross-section (by kind).

 Relative Dating of Rocks

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