I would like to comment on a recent paper by Egenhoff and Fishman (2013) that discusses observations made on cores of the Bakken Shale and presents a methodology to examine and describe these cores. In this contribution I would like to discuss some of their observations and conclusions related to perceived bioturbation features. The authors very eloquently came up with an attractive title for their paper “Traces in the Dark,” and it is this darkness that I would like to shine some light on. Some of the burrows that are shown, like the burrow tubes with contrasting fill in their...
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