Many of the islands are of volcanic formation; and a well-defined volcanic chain bounds the Cretan Sea on the north, including Milo and Kimolos, Santorin (Thera) and Therasia, and extends to Nisyros.
His studies of the eruptive rocks of Corsica, Santorin and elsewhere; his researches on the artificial reproduction of eruptive rocks, and his treatise on the optical characters of felspars deserve special mention; but he was perhaps best known for the joint work which he carried on with his friend Michel Levy.
His chief publications were: Santorin et ses eruptions, 1879; (with A.
To the student of antiquity the most interesting are: Delos, one of the greatest centres of ancient religious, political and commercial life, where an important series of researches has been carried out by French archaeologists; Melos, where, in addition to various buildings of the Hellenic and Roman periods, the large prehistoric stronghold of Phylakopi has been excavated by members of the British school at Athens; and Thera (see Santorin), the ancient capital of which has been explored by Baron Hiller von Gaertringen.
They are mostly of volcanic origin, and include pumice, tufa, santorin earth, trass and pozzuolana itself.
Objects of Cypriote manufacture are found but rarely on sites abroad; in the later Bronze Age, however, they occur in Egypt and South Palestine, and as far afield as Thera (Santorin), Athens and Troy (Hissarlik).
The arrangement is comparable with Santorin in the Aegean Sea.