ADMINISTRATIVE REPORT. LI 



Collectively, the buttered or polished stone objects number 

 several thousand, and tlie chipped stone articles are still more 

 numerous. Two hundred and fifty of the specimens are illus- 

 trated by careful drawings, many of which show profiles or 

 sections, as well as the faces of the articles. 



Mr Fowke's paj)er forms an illustrated descriptive catalogue 

 of the stone art products collected in connection with the 

 mound surveys. It is believed that the paper will be found 

 of great interest and value to the many archeologists and col- 

 lectors of the country. 



ABORIGINAL REMAINS IN VERDE VALLEY, ARIZONA 



There is a large tract in southwestern United States char- 

 acterized by arid climate, dearth of water, and scantiness 

 of vegetation. Much of this tract is mountainous, portions 

 are broad plateaus, and other portions are extensive lowlands 

 relieved by scattered mountain peaks and ranges. Structurally 

 it consists chiefly of extensive and thick formations of Meso- 

 zoic and Cenozoic age, often lying in horizontal sheets. Locally 

 these formations are broken by faults and tilted in various 

 directions, and sometimes they are crumpled and folded; and 

 over considerable areas they are associated with, or overlain 

 by, lavas and other igneous rocks. 



During the later geologic ages, that portion of the tract com- 

 prising parts of Nevada, Utah, Colorado, and New Mexico, 

 with all of Arizona and much of Sonora in the neighboring 

 Republic of Mexico, has suff"ered a general tilting southwest- 

 ward; and this tilting or warping of the earth-crust has mate- 

 rially afi"ected the geography of the region. In the first place, 

 the northeastern half of the tract was lifted into a vast plateau, 

 and thereby the temperature was lowered and precipitation 

 increased; by reason of the warping the streams flowing 

 in southerly and westerly directions were stimulated, and 

 through the increased precipitation they gained still further in 

 power; and accordingly this portion of the tract was corraded 

 into a labyrinth of canyons, among which the Grand Canyon 

 of the Colorado is most notable. At the same time, the 

 streams flowing in northerly and easterly directions were para- 



