Geologic Maps and Cross Sections
Geologic Maps and Cross Sections
Geologic Maps and Cross Sections
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Faults in <strong>Geologic</strong> <strong>Maps</strong><br />
How can you recognize<br />
titled & faults in a geologic<br />
map?<br />
Need to determine dip of fault<br />
plane, which points to hanging<br />
wall<br />
When st<strong>and</strong> astride a fault<br />
trace on a map; older rocks<br />
are on upthrown block<br />
Upthrown rocks are eroded<br />
down over time<br />
Position of tilted rocks shifts<br />
with erosion<br />
What type of fault is it?<br />
Why is this not a transform<br />
fault?<br />
Oldest =1<br />
2<br />
Upthrown=old<br />
3<br />
4=youngest<br />
Footwall<br />
Upthrown<br />
Fault Trace<br />
Hanging Wall<br />
Downthrown<br />
<strong>Geologic</strong> map of titled/faulted layers<br />
3<br />
4<br />
2<br />
young<br />
Hanging wall
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