A SAUROPOD DINOSAUR IN OKLAHOMA 



95 



the division into formations. There are no features which are con- 

 tinuous over large areas. 



The Trinity enters Oklahoma from Texas near the western 



line of Love County and leaves the state near the center of the Mc- 

 Curtain County line; and is mappable for a considerable distance in 

 Arkansas. In Oklahoma it forms a broad sandy belt of country 

 parallel to the axis of the Ouchita uplift. The average width of the 

 outcrop is about 12 miles, and its length about 200 miles. The 



