1. GY111L Geological Map Exercise Key
Geological Attitudes & 3D Block Diagram Interpretation

2. Problem 1: Strike and dip of bedding: determine orientation from symbol.
(B)
(C) 25 55
270 90
270 90
270 90 71
180
180
180
(A) 030, 55W
(B) 300, 25E
(C) 060, 71SE
(D)
(E)
(F)
270 90
270 90
270 83 90 85
180
180
180
(D) 270, 85S
(E) Horz. (dip=0)
(F) 330, 83W
(G)
(H)
(I) 75
270 90
270 90
270 90 10
180
180
180
(G) 000, 90
(H) 300, 10SW OT
(I) 300, 75NE

3. Problem 2: Strike & Dip of Bedding: determine symbol from orientation.
(B)
(C)
270 55 90
270 90
270 90 55 05
180
180
180
(A) 000, 44E
(B) 060, 55SE
(C) 300, 05SW
(D)
(E)
(F) 65
270 90
270 90
270 90
180
180
180
(D) 030, 77NW
(E) 330,65NE
(F) 330, 90
(G)
(H)
(I)
270 77 90
270 90
270 90 37
180
180
180
(G) 000, 77W
(H) 270, 37S OT
(I) Horizontal (dip=0)

4. Problem 3: Trend & Plunge of Lineation.
(B)
(C) 15 25
270 90
270 90
270 90 55
180
180
180
(A) _240, 55_
(B) _330, 15_
(C) _060, 25_
(D)
(E)
(F)
270 90
270 90
270 90 40
180
180
180
(D) _150, 40_
(E) _060, 90_
(F)_Vert._
(G)
(H)
(I) 22
270 90
270 90
270 90 55 43
180
180
180
(G) _210, 43_
(H) _330, 22_
(I) _120, 55_

5. Problem 4: Inclined bedding: add strike & dip symbols and finish the side face of
the block diagram. N 35 35 35 Df Sv Os Os Sv 35 Os Sv Df Ms

6. The sides of the block diagram.
Problem 5: Folded strata: add strike and dip symbols, fold symbols, and complete
The sides of the block diagram. N Kd Jo Kd Ta Kd Jo
Trp Pa
Trp Jo Kd Jo Pa Jo Jo Kd
Trp
Trp Pa
Trp ? Pa

7. Symbols, and complete the sides of the diagrams.
Problem 6: Folded strata with stream valley: add strike and dip symbols, fold
Symbols, and complete the sides of the diagrams. N Ox Do Sa Ox Sa Do Mg Do Sa Ox Do Do Sa Ox Sa Ox Sa ?

8. Faces of the block diagram.
Problem 7: Domes/Basins: add strike and dip symbols and complete the side
Faces of the block diagram.
-Co
-Co Sa Os Di N Mr Sa Os Di
-Co Sa Os
p-C
-Co Os
-Co
p-C
p-C

9. the side faces, and add fold symbols along the axial traces.
Problem 8: Plunging folds: add strike & dip symbols to map face, complete
the side faces, and add fold symbols along the axial traces. Q
Kpl N
Kpl Jo
Kpl
Trg Ta Jo Po Jo Jo
Kpl Po
Trg Jo
Trg
Trg ? Po

10. Problem 9: Plunging and overturned folds: add strike and dip symbols,
Complete the side faces, and add any fold axial trace symbols.
Trx Jo Jo
Kpk Ta N Jo
Kpk Qa
Kpk Jo Ta
Kpk Qa Ta Qa Ta
Kpk Qa Jo Ta

11. Reverse dip-slip -Ca -Cp H F N Ox -Ca -Ca -Cp U D Sj -Cp Ox Do Sj Ox
Problem 10 Dip-Slip Fault: add strike & dip symbols, finish side faces, and add any needed fault symbols or labels. Fill in the classification below.
Reverse dip-slip
Fault Classification:____________________________
NOTE: slickensides in fault zone were oriented parallel to dip line of fault.
-Ca
-Cp H F 35 N Ox
-Ca 35 35
-Ca
-Cp U D Sj 35 70
-Cp Ox 35 35 Do Sj 70 Ox Do
-Cp Sj

12. Side faces, and add any needed fold/fault symbols or labels.
Problem 11 Faulting & Folding combined: add strike & dip symbols, finish the
Side faces, and add any needed fold/fault symbols or labels.
Fault Classification:______________________________________
Oblique: Normal dip-slip and rt.-lat. Strike-slip Pa Sr 40 55 45 D Sr Dg
Osp U N Pa 75 60 Mw
Osp 40
-Ca HW Mw FW 60 55
p-C 60 Dg Dg
-Ca
-Ca Sr
p-C Sr
Osp