This 1-day trip examines the functionality of widely used, deep-sea fan models to adequately predict facies succession of a deep-sea fan complex. The Jackfork Formation is used as a type example for testing of this hypothesis. Six stops are described in detail, including DeRoche Ridge Highway 7 roadcut, DeGray Lake exposures (eastern shore), DeGray Dam Intake section, DeGray Spillway, DeGray Dam powerhouse, and Murray quarry, all in Clark County. Individual field-trip site information includes key reference, location, and discussion of pertinent features of each outcrop relating to the various models cited below.

Included in the report are:

• History of Model Development and description of the Walker Model, the Mutti Model,and the Vail Model
• Discussion of problems with models and requirements for effective models
• An alternative point of view: the futility of the general application of models
• Discussion of the regional basin setting of the Jackfork Formation, age, paleoenvironmental interpretations, and the Jackfork depositional basin, including factors controlling Jackfork deposition
• Maps of the Early Carboniferous paleogeographic setting and Morrow paleogeography in the Ouachita Basin
• Location map of field trip stops
• 15.5 foot-long foldout of the DeGray area stratigraphic column, in pocket

*Includes: 56 pages, 35 figures, 4 tables

Guidebook 94-2 (20.9 MB)