34 BUREAU OF AMERICAN ETHNOLOGY [bull. 74 



large stones beneath which is a thin line made by the remains of the 

 plaster floor, already pointed out (p. 30), of the same level as the 

 floor of the Terrace. This broken floor rests upon a layer of adobes. 

 Below this we find, in turn, plaster mixed with earth, the consistent 

 stratum of ash, and, finally, earth. 



Floor C . — Between the western end of Floor B' and the northern 

 end of Floor C, the higher of the two floors in Room II, and at 

 the same level as Floor C, a few pieces of plaster flooring were 

 found. This clearly establishes a connection between C and B'. 

 This is not indicated in the plan. We find that B, B', and C are of 

 the same level. C was built, as already pointed out (p. 28), over 

 Floor D. There are several indications in the wall of earth left 

 between the excavations and the road that this Floor C once ex- 

 tended some distance to the west beyond the line of the Western 

 Terrace. We can assume, I think, that the western end of B was 

 attached to the southern end of C just as we have found proof of 

 the attachment of the northern end of C with the western end of B', 

 thus forming a continuous floor around three sides of the Main 

 Structure. 



Floor on east. — AVith this floor running around three sides we 

 sought for remains of a similar floor on the east. In the earth left 

 in front of the Eastern Terrace a distinct stratification is noted 

 (pi. 2, sec. k-T). On a hard floor of adobes there rests a thick stratum 

 of large stones. On the top of this layer of stone pieces of plaster 

 were found, evidently from a floor. The level of this plaster is almost 

 exactly equal to the level of Floor B, C, and B'. It has already been 

 pointed out that earth freely mixed with large stones forms the main 

 part of the foundations of Floor B'. We therefore have for this 

 postulated floor on the eastern side a foundation similar to B' on the 

 north. It is therefore more than probable that, surrounding the 

 Main Structure, there Avas at one time a continuous floor on all four 

 sides, making, possibly, the step or terrace of a pyramidal struc- 

 ture. At the time this floor was built the depression made by the 

 Terrace on the north and south was filled in. The remains of a 

 floor on the eastern side were noted in the earth removed over the 

 Eastern Terrace and this floor probably ran to the stone wall postu- 

 lated on the eastern side of the Patio. 



Lowest floors. — As already pointed out, our one aim in the ex- 

 cavation of this site Avas to preserve all the floors and walls found 

 still in place. It was therefore impossible to study exhaustively the 

 lowest floors, as these were covered in every case by the rooms of the 

 Main Structure. Tunneling was unsatisfactory as the distance be- 

 tween the two floors is in most cases only about 1.25 m. Under these 

 conditions it was not found possible to establish the plan of the 



