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Course 3 consists of plinths which occupy the entire width of the wall. From 3.30m north to the south buttress they average, with slight variations, [illegible] a thickness of 0.27m. The top of the south buttress (the top of course 1) is at an approximate level of -0.02, and the south buttress. It is at the approximate level of +0.23m. This course of slabs is however interrupted by the buttresses in order to admit their second course into the wall.
Course 4 consists of orthostats, and is built on course 2. It is intact in part and covers 3.76m to 16.00m north (see plan fig. 24). The heights of the orthostats vary from just south of the buttress in course 2: 0.77m; north of that buttress their height is about 0.53m. The top of the course at 4.50m north is at level +0.66m; at 8.12m north it is at level +0.74m; at 12.58m north, it is at level of +0.77m; and at 15.86m north, it is at level + 0.84m. The difference in
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65 figures hard to readstruck struck outadded written in above” jug ditto, and what it repeatsword reading not certain