Soil that contains large quantities of calcium was most likely formed by the weathering of

Limestone

Limestone are form of sedimentary rocks mainly compose of skeletal fragments from marine fragment such as molluscs, forams and corals. Aragonite and mineral calcites are the major minerals found in limestone which were different crystal forms of calcium carbonate.  Also, they are an organic sedimentary rock which forms from the accumulation of coral, algal, shell and facal debris.

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