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current | 02:28, 4 November 2009 | 600 × 765 (88 KB) | Plazak | ((Information |Description = Map of Michigan Basin, USA, showing outcrop of Antrim Shale, and main area productive of natural gas in the Antrim Shale. |Source = USGS Open File Report 96-23 |Date = 1996 |Author = Ro |