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Massachusetts Treasures: Famous Formations: Clay Concretions By HF Guest Blogger, Maria Sansalone Thanks again to everyone who participated in the Connecticut Valley Mineral Club’s geology contest! To answer our last contest question, read the following carefully: Clay Concretions are flat, usually round discs of clay and silt that formed underwater along the Connecticut River. These formations are not as old as some mineral occurrences in the area. Still, they are estimated to… Read More

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