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BLACK SHALE--ITS DEPOSITION AND DIAGENESIS 1 Some black shale units have served as host rocks for syngenetic metal deposits. Black shales have formed throughout the Earth's history and in all parts of the world. Wire Shelving | Costco Find a selection of high-quality Wire Shelving products at Costco Business Center for delivery to your business. Storage Cabinets & Shelving Units | Costco Find a great collection of Storage Cabinets & Shelving Units at Costco. Enjoy low warehouse prices on name-brand Storage Cabinets & Shelving Units products.    Read More