A sedimentary rock formed from clay deposits is called shale.

Here's why:

* Clay: Clay is a very fine-grained sediment, often formed from the weathering of other rocks.

* Sedimentary Rock: Sedimentary rocks are formed from the accumulation and cementation of sediments.

* Shale: Shale is a type of fine-grained sedimentary rock that is primarily composed of clay minerals.

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