1897.] DEAKE — THE GEOLOGY OF INDIAN TERRITORY. 419 



ley, four to five miles west of Chelsea. Some of the wells flow, 

 but none of them produce very much oil. The foreman of the 

 works informed me that the greatest flow of any one well was about 

 a barrel per day, and that the oil was struck in a micaceous shaly 

 sandstone. This sandstone is probably the bed that outcrops 

 east of Chelsea, and lies between the two lower coal beds. The 

 rock beds are practically horizontal in the area where the oil wells 

 have been sunk, but the strata passed through, in sinking the wells, 

 come to the surface farther eastward. The oil is probably derived 

 from the Lower Coal Measures shale beds that outcrop along the 

 Missouri, Kansas & Texas Railway, east of Chelsea. 



Building and Ornamental Stone. — The sandstones, limestones, 

 marbles and granite that occur in this field are adapted to many 

 uses in construction work. Sandstones are very abundant, except 

 in the Boone chert area, throughout almost the entire field. They 

 are usually evenly textured, massive, tough, and are well adapted 

 for ordinary building purposes. The best limestones for building 

 purposes are confined to the Lower Carboniferous and especially to 

 the upper Boone limestone horizon. Massive beds of tough gray 

 evenly-textured limestone are common in the Boone limestones. 

 The Boston group also contains some good building limestones and 

 occasional thin beds of limestone were seen in the Permian area that 

 are fairly good for building purposes. The outcrops of the marble 

 beds are shown in PL IV. Massive beds of marble, twenty-five 

 to thirty feet thick, outcrop at nearly every marble area shown 

 in that plate. The thickness of the marble beds has not yet been 

 determined, but from drill borings it appears to be one hundred 

 and fifty feet or more. The marble is usually pink colored, but 

 some of it is gray and a little is practically white. So far, the 

 marble that has been quarried contains a great many fractures and 

 rather abundant small cavities, partly or entirely filled with large 

 calcite crystals. Further investigation may result in finding better 

 marbles than the surface outcroppings. Some of the bed that is 

 at present being quarried can be advantageously used for building 

 and ornamental uses. 



The granite found on Spavinaw creek is an excellent stone 

 for building and ornamental purposes, but it is at present too far 

 from any railway to be profitably quarried for marketing. For a 

 more extended discussion of the various kinds of rock previous 

 pages may be consulted. 



