One difficulty you may encounter in understanding the makeup of the Pajarito cliffs stems from the very different appearance of the two opposite walls of such a canyon as Frijoles. In the north wall, facing the sun, the cliffs stand bold and somewhat barren; in the south and shadowed wall, there are no prominent cliffs, but rather a rough slope of boulders overgrown with trees and brush. Because of this contrast, it might be difficult for you to realize that the two walls are made up of nearly identical rocks. The difference in appearance is due simply to the difference in exposure. The north wall, hot and dry in the sun and subject to extremes of temperature, has never had a heavy vegetative cover and has eroded into a cliff; the south wall, relatively cool and moist, has been able to support a growth of plants which have held and produced soil sufficient to mask the underlying rocks. As mentioned earlier, the geology of this locality is complicated to such a degree that the foregoing discussion should be considered as only a general outline. The whole story of the Jemez volcano has not yet been worked out in detail, for the eruptive activity was on a scale so vast and involved such complex forces that geologists are continuing to evolve new concepts as new facts come to light. _Guide to the Area_ FRIJOLES CANYON. Monument headquarters are at the terminus of the approach road, on the floor of Frijoles Canyon. This center of development is the focal point of activity throughout the year. Listed below are the features of interest to be found in and around the headquarters area; reference to the map on pages 20-21 will help to locate the points mentioned. 1. _Administration Building and Museum._ This building contains a reception information desk manned by park rangers and a lobby from which visitors leave to walk to the ruins. Reference books are available from the monument library on request, and a stock of publications on pertinent subjects is for sale. The museum occupies a part of the headquarters building. Three rooms of exhibits present Indian artifacts and information on the life and origins of the prehistoric people, and on the modern Pueblo Indians of the vicinity. A visit to the museum is advisable before making a trip to any of the ruins, since the exhibits provide a background against which the ruins are better understood and appreciated. 2. _Tyuonyi Ruin_ lies about 500 yards by trail up the canyon from headquarters. This ruin is one of the principal way-stations on the loop trail over which the trips are routed. Other features on this same loop are an unexcavated ruin, the Big Kiva, Sun House, Cave Kiva, and Long House.