Figure G-47 contains a geologic map and topographic profile. Two wells have been drilled in the area, as indicated on the map. Well number 1 encountered a thrust decollement at 1500 m. Well number 2 encountered the following units:

Regional mapping indicates that the thickness of Cretaceous rocks is 700 m.

Use the map, together with stratigraphic thicknesses from the well log and regional mapping, to construct a cross section on the topographic profile. Be sure to show the eroded layers above the level of the present exposure. Determine: 

(1) The type of fold present, and 

(2) The amount of shortening.

Figure G-47

Transcribed Image Text:

Depth to top of unit (m) Unit encountered 350 900 1680 2150 Jurassic rocks below an interval of fault gouge Triassic rocks Permian rocks Proterozoic crystalline rocks