TOZZER] EXCAVATION AT SANTIAGO AHUITZOTLA, MEXICO 89 



in front of the Terrace and level with the floor. This is noted espe- 

 cially over the northern side. The extension of the floor of the 

 Terrace in the southwestern corner (Room X) destroyed a part of 

 the Southern Extension and especially Floor H over which Room X 

 was built. But there is little reason to suppose that Rooms IX and 

 XI were abandoned at this time. The floor of the Southern Terrace, 

 other than in Room X, reached m all probability the northern wall of 

 Rooms IX and XL It could not have extended to the south of this 

 wall, as the wall is still in place under Floor B. It is impossible 

 to tell how far the widened Terrace floor extended on the western, 

 northern, and eastern sides. On the north the Terrace was extended 

 by building Room XII and the floor under B'. On the east the re- 

 mains of a floor appear to show that the Terrace was extended on 

 this side. 



Period V. — The Northern Extension is clearly later than Period 

 IV, as Floor M is built over Room XII, the addition to the Terrace 

 floor at the northwestern corner. Floor M runs up to the walls of 

 Room XIII, as does also Floor N, showing that they were contempo- 

 raneous. I have included in this period Floor J, to the south of Room 

 X and slightly higher than the floor of this room. Ploor J', a small 

 piece of floor found above the floor of the Western Terrace, should 

 also be included. Both J and J' are of the same level as M, N, and O. 

 There should be mentioned in connection with these floors the remains 

 of two small pieces of plaster found in excavating the northern end 

 of Room XI. These are of the same level as Floor J. It is suggested 

 that a floor of this level covered at one time the western and southern 

 sides of the site. 



Period VI. — This is marked by a decided change in the plan of the 

 site. The higher level floors which come in this epoch are built 

 almost entirely over earlier constructions. The Southern Extension 

 was probably filled in, as Floor B is built over the northern wall and 

 also runs over the floor in front of the Southern Terrace. Floor B 

 probably ran to the west over Room X. Floor B', on the north, 

 was built over Room XII and probably over Floors M-0, which 

 may at one time have extended under B'. There is difficulty in de- 

 termining the relation of Floor C, Avhich in this period connected 

 B with B', with Floor D, the original floor of Room II of the Main 

 Structure. It is probable that Floor C once entirely covered Room 

 II. In excavating Room I a small piece of plaster floor was found 

 near the southwestern corner, 0.27 m. above the main floor. This 

 would be about the height of Floor C in Room II. This latter floor, 

 the connection between B and B', may not only have covered the 

 entire Room II but may have once extended into Room I. I have 

 tried to show elsewhere (p. 31) that the square formed by B, C, and 

 B' was completed on the east by a floor the remains of which are 



