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1833 C. Lyell Princ. Geol. III. 76 The marine sub-Etnean beds.

1904 F. H. Jackson Sicily 167 Many lava flows are crossed before arriving at Aderno, the most important sub-Etnean town after Catania and Aci Reale.

2000 Marine Geol. 167 107/2 These clays form the substrate for much of the eastern and southern flanks of the Mount Etna volcanic edifice and are known as the sub-Etnean clays.