Great Kiva, the stone discs were originally set into past holes to hold log roof supports [slides]  Picture of Records 

 - U.S.A.  Picture of Records 
 - 1 Slide  Col.  ill  35mm. 
 - Picture of Records Collection from U.S.A. .
<br/><br/> IGNCA slides collection, cross reference Chaco Canyon Architecture from U.S.A.,p.2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Architecture-New Mexico (U.S.A.)<br/>Kivas
<br/><br/><label>Dewey Class. No.: </label>PR-CC  / 12