The Deep Boring at Spur
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In the northwest part of the State, east of the Pecos, the formations lie nearly horizontal. This structure prevails over the entire Plains, extendingfrom the north end of the Panhandle to a line joining San Angelo and Pecos on the south. This area measures 330 miles from north to south and 170 miles from east to west. The deeper lying rocks can hence be known here only from inferences based on their appearancein distant outcrops outside of this area and from such local observations as maybeobtained fromdeep explorations. It is singularly fortunate for our knowledgeof the stratigraphy of this part of the continent that a deepboring was made at a point not far from the central part of the area denned. The exploration enables us to know by actual observation what strata underlie. It will enable us to say with greater accuracy what other borings will penetrate even at considerable distances from this exploration. It furnishes firsthand information on the stratigraphy of this part of the State. While this paper describes the section of a single boring,it really gives the only facts so far known concerning the deep stratigraphy of a region covering one-fifth of the area of this State.