The boundaries of CB 47 were laid out by a baseline extended from the eastern wall of CB 45. CB 45 was initially laid out using a baseline shot with the transit off the grid point PC 1 and a second baseline extending from it at a ninety degree angle. Using triangulation a two by three meter trench was established with the northwest corner at a location of 33S/8W.
The coordinates of the four corners of CB 47 at the time of the start of the 2011 season are as follows:
NW corner: 33S/8W
NE corner: 33S/5W
SE corner: 35S/5W
SW corner: 35S/8W
A datum point with an absolute elevation of 31.20 meters was established on a tree to the southeast of the trench.
Drawing of the trench layout
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