Abstract
The chapter discusses small-scale details on sedimentary features. The observations are a result of field work in the Arkansas barite belt. Small-scale features of the Mississippian barite beds of Arkansas are described. Their top-bottom or geopetal nature shows that they must have originated during sedimentation and diagenesis. These hitherto unknown features of primary sedimentation and the wide-spread regional distribution at distinct stratigraphic and paleogeographic loci rule out the conventional epigenetic theory. The three basic small-scale geometric patterns pertaining to the barite in the Mississippian Stanley Shale of Arkansas are (1) continuous beds of variable thickness and grade; (2) lenticular and worm-like bodies; and (3) nodules of pure barite.
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