calcareous soil

calcareous soil (kălkâr`ēəs), soil formed largely by the weathering of calcareous rocks and fossil shell beds. Different varieties usually contain chalk, marl, and limestone and frequently a large amount of phosphates. They are often very fertile, as in the case of the buckshot soils of the S United States. Sometimes calcareous soils are flinty, thin, and dry. They often form a large part of the soil of deserts, which may prove very fertile when sufficient moisture for crops is applied.

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calcareous soil [kal′ker·ē·əs ′sȯil]

(geology)

A soil containing accumulations of calcium and magnesium carbonate.