Pillow lava

Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava underwater, or subaqueous extrusion. Pillow lavas in volcanic rock are characterized by thick sequences of discontinuous pillow-shaped masses, commonly up to one meter in diameter. They form the upper part of Layer 2 of normal oceanic crust.

Pillow lava on the ocean floor of Hawaii
Pillow lava near Oamaru, New Zealand
Weathered Archean pillow lava in the Temagami Greenstone Belt of the Canadian Shield
Pillow lava formations from an ophiolite sequence, Northern Apennines, Italy

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