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DESCRIPTION: A Concretion is a compact mass of precipitated minerals which is commonly spherical to discoid in overall shape and is found embedded within a host rock which is common;y of a different composition.

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Figure 1 - Large Concretion growing within fine sediments.  These large nodules found in northwest NY State near the Great Lakes shore are commonly Septarian in nature.

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Figure 2 - Large Concretion growing within fine sediments as for Figure 1.  In the background is a Tillite

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