Drilling activity late in 1927 in the Champagnolle district of north-eastern Union County, Arkansas, which discovered a new pool of oil and gas, later named the Rainbow City field, has subsequently uncovered interesting geological conditions.

In this field are two producing horizons which according to our present understanding of the stratigraphy are in the Trinity group of the Comanche series (Lower Cretaceous). Owing to the character of the strata, which consist mainly of non-fossiliferous red clays and light-colored sands, it is difficult to recognize any definite horizon throughout the area.

The upper sand at about 2,900 feet in depth produces...

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