Primary structures of volcanic rocks

 

Images copyright © 1998-2016, John W.F. Waldron, except where otherwise stated

pillowlava

Pillow lava showing younging direction, Trooodos Massif, Cyprus

pillow lava

Mafic pillow lava overlying a massive flow or sill with columnar jointing. Green Gardens, NL.

pillow lava

Close-up of pillow lava, Green Gardens, NL.