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Marcellu ShaleEssay Preview: Marcellu ShaleReport this essayMarcellus ShaleWhat is the Marcellus Shale you ask? What are some advantages and disadvantages of this operation? The Marcellus Shale is a geological formation formed by the accumulation of sediment into a sea. Over time the sediment compresses to produce an organic-rich black shale. Shale is a fine-grained sedimentary.