TozzER] EXCAVATION AT SANTIAGO AHUITZOTLA, MEXICO 31 



and B'. It is clear that it extended to the west under the present 

 road. 



As on the southern side, there is evidence of a plaster floor under 

 B' (pi. 2, sec. i-j), showing that the entire Northern Terrace floor 

 once extended some distance to the north. Floor U' in front of the 

 Terrace on this side was covered by adobes to the level of the Terrace 

 floor. 



Floor on east. — The Eastern Terrace floor was also probably ex- 

 tended in the same way as on the other three sides, as remains of a floor 

 corresponding in height to that of the Terrace are seen in the earth 

 left in place on the eastern side of the excavation. These continua- 

 tions of the floor of the Terrace on all four sides would greatly en- 

 large the area of the Main Structure. There were no stones found 

 marking the edge of the extended Terrace. 



Southern extexsion. — Rooms VII-XI (pis. 6, a; 7, a) are a unit 

 and quite distinct from the Main Structure. This part of the site 

 was probably used for refuse when the latter was built. It is here 

 that we found the beds of ashes (pi. 2, Pits XV, XVI) containing a 

 large niunber of shards. The rooms of the Southern Extension are 

 built over these ash deposits. 



Room IX. — This is the main room in this part of the site. A line of 

 five pillars ran around the southern and eastern sides, probably sup- 

 porting a roof. These columns had fallen, but they are clearly indi- 

 cated on the floor (pi. 6, «). The central part of the room may not 

 have been roofe'd over. In the excavation of this room a mass of 

 adobe (pi. 2, 13) was found near the center. This had not been re- 

 moved when the photographs were taken and is seen in plate 6, a. 

 Later this was taken up, and it was found that the floor runs under 

 it with no break. 



Room X, attached to the Terrace of the Main Structure, was built, 

 as already mentioned, after the Southern Extension, as Floor H runs 

 under it. Floor H is slightly depressed (pi. 6, «), and the line of 

 depression is marked by worked stones. As it was not thought best 

 to remove the upper floor, and as there was no room for tunneling, 

 Floor H could not be followed out. 



Floor K, on the northern side of Room IX, slopes upward and was 

 probably once attached to Floor U", extending in front of the Ter- 

 race. 



A part of the northeastern wall of Room IX is covered by the 

 western end of Floor B. The end of the wall widens out, and on the 

 northern side there is a decided slope to the wall similar to many at 

 Teotihuacan. At the northeastern corner the wall overhangs (pi. 8, 

 d) , also a feature at Teotihuacan. 



The western side of Room IX is more or less indefinite. There 

 was undoubtedly another large room to the west extending under the 



