Bisbee daily review., 1904-02-13
The Geology
 AND COPPER Deposits of Arizona
4 CONDENSED FORM OF THE SAL
 TENT RESULTS.
Of the Bisbee Quadrangle Carried on During the Year 1902-eeing a Com plete Analysis of the Mineral Re- cion Pich in Wealth.
(Wri.ten by F. l.. Ransome.) )

] n condensed form the salient results of a detailed geological study of the Bisbee qu1 irangle, Arizona, carried cn during the latter part of the year 1902. l. is essentially an abstract of the final official report which will shortly papers of the United States Geological Survey. accompanied by maps, sections and illustrations.
 l. Geoyraphy-The Bisbee quad irsngle. which includes the Warren mining district. lies in Cochise county. in the southeastern part of Arizona, adjoining the Mexican boundary line. The area of the quadrangle is about ITO equare miles, and includes the southeastern half of the Mule noun tains. enc of the smaller of the iso- lated ranges characteristic of this part oi Arizona. The Mule mountains, while less markedly lirear than the i Dragoon. Huachuca. Chiricahua and other neighboring ranges. have a northwest and southeast trend. They
 
 , the town Of Tombstone to the Mexi- can borC er, a distance of about thirty miles. On the northwest they are separated by the broad. fiat foor of Sulphur Springs valley from the Chiri- cahua range and on the southeast by San Pedro from the Huachuca range. The maximum width Of the range is about twelve miles, and it's greatest height is attained by Mount Ballard. west of Bisbee. which is 7400 feet above sea level
 | The town of Bisbee. with an es- timated population of 6,000. is crowd near the heart of the range, seven and half miles north of the international boundary. U is connected by the Fl Paso & Southwestern railroad to the eas. with the new town of Douglas, in Sulphur Springs valley, with Deming and Fl Paso. To the west. branches ! of the same road run to Naco on the Mexican boundary, to Tombstone and 10 Benson on the the main line Of the | las, connection is made with the Naco- sari railroad to Cos, and at Naco to Cananea, thus bringing the new smelt- CTS at Douglas within reach of the i'm | rortant mines at Nacozari and Cana nea, in the state of Sonora. Mexico. H.-Geaeral Geology.-The first at tempt 10 describe the geological en- vronment of the Bisbee copper ores was that of Wendt, in 1887, followed thirteen years later by a more con- prehensive account by Douglas. Both these papers, however. touch but brief | ly on the geology and structure of the Mule mountains. being concerned mainly with the ore bodies and the n.etalurgy of the ores. Dumble's reconnoisance notes, published in ary. are really the first step toward any general knowledge of the broader geological features, and to him is due tie first recorded recognition of the extensive cretaceous deposits of the Bisbee region.
 ] The ro-ks Of the Mule mountains may be primarily divided into five main groups: CD a pre-cambrian basement of crystalline schists; CD a poleozoic sedimentary series; (3) mesozoic sedimentary series; (D. qrarternary valley deposits; and (5) intrusive igneous rocks
 One standing upon Mount Ballard can look out over the clustered ridges land peaks composing the mountain range and 10 a certain extent trace the general distribution of the rocks by the character of the topography The quaternary deposits floor the broad valley plains stretching away ' rom the intricately embayed line marking the foot of the mountains. The northwest-southeas diagonal of the Bisbee quadrangle. a line which passes very near the town of Bisbee. and corresponds with the course of Tombstone canyon. roughly divides the mountainous part of the quadran- gle in two typographical divisions. Northeast of this line the mountains are sculptured from comparatively soft Mesozoic beds, striking approxi- . mately with the trend of the range (N. W-s. E) and dipping at generally moderate angles toward Sulphur Spring valley on the northeast. The slopes of these hills are comparative , y smooth. although the occurrence of hard fossiiiferous limestone in the middle of the generally arenaceous group has occasioned a persistent CHI Of erosion. conspicuous from points near Bisbee. Southwest of this line, Pre-Cambrian sohists and Paleozoic beds, both cut by eruptive rocks, prevail. These are more re- sistant of erosion and more heteroge- neous in character than the Mesozoic |