The middle Trentonian Kirkfield, Shoreham, and Denmark limestones have been studied with emphasis on lithic and primary structural details. Statistical treatments of the data bring out relationships not obvious in normal procedures and enable more precise statements of the quantities. Regression lines have been utilized in an analysis of facies changes. The standard errors of estimate and t tests of the regression coefficients show the value and reliability of the lines. Thus, the Shoreham and Denmark formations become progressively and significantly more argillaceous to the southeast. Northeast-southwest currents are recorded in the directions of pararipples and oriented fossils. Intraformational folds show remarkable parallelism, attributed to differential movements in unconsolidated material. New members of the Denmark formation are recognized, and new faunal zones delineated.