Magnolia-area residents took a close look at Southwestern Energy's Fayetteville Shale operations in Faulkner County on Wednesday. *BREAK* The interest in SWN stems from the company's involvement with oil exploration in the Lower Smackover Brown Dense, a rock formation under South Arkansas and North Louisiana. Southwestern Energy has just begun drilling the second of a dozen test wells into the Brown Dense to learn if marketable amounts of oil can be produced. Southwestern Energy is the largest driller of natural gas wells in the Fayetteville Shale of North Central Arkansas. It plans to use the same rock fracturing and horizontal...