ILLUSTRATIONS 



Page 

 Plate 1. Panoramic view uf the northern wall of El Ritu de los Frijoles canyon . 1 1 



2. Canyon of El Rito de los Frijoles, showing vertical tufa bluff on the 



northern side and the general slope of the mesa to the southeast. 25 



3. a. Pajarito plateau at El Rito de los Frijoles, Jemez mountains in the 



background, b. Rio Grande canyon below El Rito de los Fri- 

 joles, cut into basalt, the basalt-tufa contact showing on the right. 26 



4. a. Lower part of El Rito de los Frijoles canyon, cut into basalt, the 



basalt-tufa contact on southern side of the canyon showing on 

 the right, b. Basalt-tufa contact on the northern side of the 

 lower part of El Rito de los Frijoles canyon, opposite a 28 



5. Contacts of sandstone and basalt, where the basalt is intruded into 



the sandstone, lower part of El Rito de los Frijoles canyon 30 



6. a. Lower El Rito de los Frijoles canyon where it is cut into the basalt 



at the upper falls, the sandstone below the falls showing near its 

 contact with the basalt, b. Weathered surface of tufa at El Rito 

 de los Frijoles 32 



7. Upper Rito de los Frijoles canyon, where it narrows above the ruins. . 34 



8. (I. Tufa cliff at El Rito de los Frijoles, showing "tent rocks'' at the 



base. b. Tufa cliff near ( 'erenionial ( 'ave. El Rito de los Frijoles, 

 showing banding in upper half of the formation 37 



9. Tufa showing hard bands and the })eginning of the formation of "tent 



rocks," owing to the protection of the soft lower part by the hard 

 bands 3S 



10. "Tent rocks," showing two of them still capped by the protecting 



fragment of harder tufa 38 



11. Archeological map of a part of the Pajarilo plateau 76 



Figure ]. Mean precipitation, by months, at 8anta Fe, Espafiola, New York, 



and St. Louis 45 



2. Annual march of temperature at St. Louis, Santa Fe, and Espafiola . 4(5 



9 



