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4 | June 2008 ABSTRACT Although largely unstudied until recently, the Barnett Shale of the Ft.Worth Basin,Texas, has become one of the better known black mudrock successions in the world. Emerging results of new research on these rocks, based mostly on subsurface data, offer intriguing insights into fundamental aspects of mudrock formation.Among these insights is the recognition that mudrock facies are probably not widely continuous, that organic matter conversion to hydrocarbon may control distribution and abundance of nanoscale pores and thus permeability, that fracture distribution may be affected by mineralogical variations along a proximal-distal gradient, and that, based on trace element chemistry, the Barnett ocean may have been much more stratified than most other anoxic basins. Developing concepts of processes and products of mudrock formation being derived from Barnett research offer great potential for comparison to other mudrocks worldwide.

Black Mudrocks: Lessons and Questions from the Mississippian Barnett Shale in the Southern Midcontinent