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A solid, hard mass formed by a process of aggregation or coalescence
“Limited dolomitization of the calcite around the edges of the fossils and in the matrix of the concretion occurred at a later stage.”
An accumulation or pile of things
The process of converting, or of being converted, into a fossil
A small, hard object, in the shape of a pebble, that sometimes forms in the gallbladder or bile duct
A measure of the quantity of matter contained by a unit volume
A building material made of cement, sand, stone, and water that hardens to a stonelike mass
A hardened layer, coating, or deposit on the surface of something
A small piece of rock found on the ground
A physical area or expanse, usually large
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