My professor is asking me how do I determine the contact lines on geologic map 2

Question

My professor is asking me how do I determine the contact lines on geologic map 2(bottom) derived from geologic map 1(top). Why these contact lines are straight not curved. I really have no idea why. Can someone explain this to me? Thank you.

INTERPRETATION IN GEOLOGIC MAPPING On the two maps shown below one can clearly see the interpretative nature of field mapping. Although the geology of this hypothetical arca is really very simple, it must still be inferred from incomplete data Always remember that Mother Nature is a bitchMost areas of temperate North America are covered with thick surficial deposits, including soils, coluvium, alluvium etc. These units obscure the geology and we must piece it together from the few outcrops available to Imagine what it would be like to infer truly complex geology in an area of dense vegetation and thick soils like the Santa Craz Mountai 32 E E 300E 44E 200s Figure 3.5 li mapping.A) Outcrop map showing locations of rock exposures relative to distances within surveyed grid. UB) Geologic map 500w ow 300W 200W E-W E200E 300 400Einterpreled on the basis of the autcrop relationships shown in A

Explanation / Answer

In map 2 the contact lines are between igneous rock and rock layer where red river is located. Shale and rock layer with red river. Sandstone and rock layer with red river. Shale and igneous rock. Contact lines are shown in geology where two layers meet together. They are not curved because the line between rocks are faults and it occurs in a linear fashion. The angular unconformity is shown in plan as a straight line, but in section it may be irregular.

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