1 tO JI. F. BAIN — GEOLOGY OF THE WICHITA MOUNTAINS 



Peel 



x. Limestone, thin shaly, with some sandy material 50 



9. Limestone, blue, heavily bedded 450 



K). Limestone, thin bedded, sandy so 



M. Limestone, heavy, blue ; dip, 35 degrees 510 



12. Limestone, breceiated, rounded, and angular; fragments imbedded in 



calcaroua matrix ; no evidence of especial crushing 10 



l.'i. Limestone, bine, earthy, with chert for a thickness of 100 feet GOO feet 



above base, and fossils near top 1,250 



It is possible that numbers 10 and 11 are repetitions of 8 and 9, due 

 to an obscure dip fault, but it was impossible to determine this absolutely- 

 Number 13 seems to represent the same horizon as that from which nu- 

 merous fossils were collected in the hills east of Rainy mountain, and 

 would accordingly be Calciferous. According to this determination the 

 section was not at this point carried up to the Trenton. A total thickness 

 of more than 4,000 feet was measured in this vicinity, and it is doubted 

 whether the combined Cambrian and Ordovician much exceed this thick- 

 ness, though in view of the changes in dip and liability to faults the ques- 

 tion must for the present remain open. 



At Rainy mountain the lower beds are not shown, and the Trenton 

 only is exposed. The Calciferous is exposed in the group of detached 

 hills east of the school, and on the plain between these hills and the 

 mountains there is a suggestion of the basal conglomerate at the proper 

 horizon. These basal beds are shown again at the granite and porphyry 

 hills, about 10 miles southeast of Mountain view, and at the east end of 

 the Carrollton mountains, just west of the rifle range at Fort Sill, as w r ell 

 as on the south side of Signal mountain. No trace of any sedimentary 

 rocks was found on the south side of the mountains west of this point. 



G ER O V IMO S EH I ES * 



Rocks later than the Trenton were only seen southeast of Fort Sill- 

 East of Cache creek and near the southeastern corner of the military 

 reservation are certain limestone mesas known because of the presence 

 of a number of asphaltum springs. This series of rocks include much 

 shale and sandy limestone. It is characterized by low dips and extends 

 some distance east of Fort Sill, on the Marlow trail. Near the base of 

 the series the shales are interbedded with a conglomerate having a cal- 

 careous matrix and carrying large, 2-inch, rounded pebbles of granite, 

 porphyry, and limestone. Unfortunately, no recognizable fossils were 

 obtained from either the shales or the overlying limestones, and hence 



* Jn the absence of any more available name, this series is called after the famous Apache chief, 

 who now lives as a prisoner of war at Fort Sill, 



