SMITHSONIAN EXPLORATIONS, I93O 29 



The rocks in this old land mass are quite similar to the gneisses in the 

 inner gorge of the Grand Canyon, and must have furnished the 

 material now composing much of the Cambrian and subsequent strata 

 offshore to the north. 



The Cambrian series exposed in Music Mountain outcrops south- 

 eastward for a short distance, extending perhaps to the vicinity of 

 Seligman. In the middle portion of the above-mentioned diagonal 

 boundary of the sedimentary plateaus, no Cambrian is present, and a 

 much younger series of beds rests directly on the ancient weathered 

 rock surface. Southeastward from Globe, however, Cambrian sedi- 

 ments reappear, but contain no beds correlative with the Grand Canyon 

 sequence. Doctor Stoyanow had worked out these general strati- 

 graphic facts by years of patient work and it was a great privilege and 

 pleasure to have him point out the evidence on which he based his 

 conclusions. 



In a trip across Arizona, it is interesting, especially to one who has 

 not previously seen the southwest, to note how very sensitive the flora 

 is to elevation. The various cacti seem to have exact physiologic re- 

 quirements, and therefore even a low hill will often rise above the 

 level required by a conspicuous cactus. Another exceedingly interest- 

 ing experience was a visit to Natural Bridge, which is situated not far 

 from the villages of Pine and Payson. Here one finds both unusual 

 geologic features and interesting human activities. A deep, V-shaped 

 canyon was cut by a small stream flowing apparently along a fault 

 zone, as the rock series in the two walls of the canyon are not the 

 same. Several large springs issue from the east side of the canyon 

 several hundred feet above its bottom. Algae living in the abundant 

 waters from these springs have precipitated enormous quantities of 

 lime, until a level fill several hundred feet deep and 25 acres in extent 

 was formed across the canyon. Subsequently, the creek dissolved a 

 channel through this fill, thereby forming a large natural bridge. More 

 than 50 years ago a Scotch family occupied this level tract which is 

 naturally very fertile but almost completely shut off from the world. 

 Mrs. Goodfellow, the wife of the original settler, is still living, and 

 it is very interesting to hear her accounts of the early days. Fruit 

 trees of many sorts were planted when the Good fellows first arrived. 

 An apricot tree planted 52 years ago beside one of the irrigation ditches 

 apparently found its situation most favorable. Its trunk is now more 

 than 3 feet in diameter, with a spread of branches exceeding 100 feet, 

 and this summer the tree bore approximately 100 bushels of fruit. 

 After an extended survey the Los Angeles papers are reported to have 

 admitted that this is the largest apricot tree in the world ! 



