Page 293 - Laboratory Manual in Physical Geology

crop out. To visualize this, geologists use block diagrams. on top and a geologic cross section on each of its visible

A block diagram is an oblique sketch of a block of Earth’s sides ( FIGURE 10.2 ). Notice how the block diagram in

lithosphere, like a block of cake cut from a sheet cake FIGURE 10.2 gives you a three-dimensional perspective of
and viewed from one corner, just above the level of the how the formations are oriented.
table on which the cake is sitting. It has a geologic map
ACTIVITY ACTIVITY

10.5 Cardboard Model Analysis 10.7 Nevada Fault Analysis
and Interpretation Using Orthoimages

THINK | How are three-dimensional models THINK How do geologists define, analyze, and
About It used to visualize geologic structures? |
About It interpret geologic structures using
images of landscapes?
OBJECTIVE Visualize, analyze, and interpret

geologic structures using cardboard models.

OBJECTIVE Analyze and interpret Nevada faults
PROCEDURES using orthoimages.
1. If you have not already done so , then fi rst read PROCEDURES
Attitude—Strike and Dip, Constructing Geologic 1. If you have not already done so , then fi rst read
Cross Sections, Fractures and Faults, Folded Attitude—Strike and Dip, Constructing Geologic
Structures, Unconformities, and Cardboard Models Cross Sections, Fractures and Faults, Folded
next. Also, this is what you will need :
Structures, Unconformities, and Cardboard Models
___ scissors and protractor and ruler cut from next. Also, this is what you will need :
GeoTools (at the back of manual) ___ dark pen (red or blue)
___ Activity 10.5 Worksheets (pp. 277–278 ) and ___ Activity 10.7 Worksheet (p. 281 ) and pencil
pencil
2. Then follow your instructor’s directions for
2. Then follow your instructor’s directions for completing the worksheets.
completing the worksheets.

ACTIVITY

ACTIVITY 10.8 Appalachian Mountains
Geologic Map
10.6 Block Diagram Analysis
and Interpretation THINK | How do geologists d efine, analyze,
About It and interpret geologic structures using
THINK | How are three-dimensional models geologic maps?
About It used to visualize geologic structures?

OBJECTIVE Construct and interpret a geologic cross

OBJECTIVE Visualize, analyze, and interpret section of folded rocks.
geologic structures in block diagrams.
PROCEDURES
PROCEDURES 1. If you have not already done so , then fi rst read
1. If you have not already done so , then fi rst read Attitude—Strike and Dip, Constructing Geologic
Attitude—Strike and Dip, Constructing Geologic Cross Sections, Fractures and Faults, Folded
Cross Sections, Fractures and Faults, Folded Structures, Unconformities, and Cardboard Models
Structures, Unconformities, and Cardboard Models next. Also, this is what you will need :
next. Also, this is what you will need : ___ protractor and ruler cut from GeoTools at the
___ Activity 10.6 Worksheets (pp. 279–280 ) and back of the lab manual
pencil ___ Activity 10.8 Worksheet (p. 282 ) and pencil
2. Then follow your instructor’s directions for 2. Then follow your instructor’s directions for
completing the worksheets. completing the worksheets.

Geologic Structures, Maps, and Block Diagrams ■ 263