Economic mineral deposits of ____ are common in Carboniferous and Permian strata in the northeastern part of the U.S., where they formed as organic sediments (i.e., the remains of plants) deposited in wetland environments west of the Appalachian Mountains.

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The economic mineral deposits formed from organic sediments in wetland environments suggest the mineral deposit is coal. The Carboniferous and Permian strata are known for coal deposits, and the location west of the Appalachian Mountains aligns with areas where coal mining has historically been prevalent. Gold, uranium, and platinum are not commonly found in these strata or environments. Archaeocyathid is a type of fossil and not a mineral deposit.

Economic Mineral Deposits of ____ Are Common in Carboniferous and Permian