Points A, B, and C in Fig. G-4 are oil wells drilled on a level plain, and all of the wells tap the same oilbearing sandstone. The depth (not the elevation!) of the top of this sandstone in each well is as follows: A = 5115 ft, B = 6135 ft, and C = 5485 ft.

1. Determine the attitude of the sandstone.

2. If a well is drilled at point D, at what depth would it hit the top of the sandstone?

Fig. G-4

N TV B D 1000 500 0 1000 feet