Pillow structure

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In geology a pillow structure is a primary sedimentary structure that resembles a pillow in size and shape.

Pillow breccia is a deposit of pillow structures and fragments of lava in a matrix of tuff.

Pillow lava are pillow-shaped structures sometimes seen in lavas and are attributed to the congealment of lava under water, or subaqeous extrusion. A pillow structure in certain extrusive igneous rock is characterized by discontinuous pillow-shaped masses, commonly between 30-60 cm. in their greatest dimension.

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