PIDGEOLOGICAL FORMATIONS. THE has arisen from the decomposition of the hæmatite. Large deposits of this exist, which have been profitably worked. The general appearance and vivid colouring of the country consisting of rocks belonging to this series make it easy to recognize from a distance. 17 At Bostánah and Hamairan on the mainland of Persia near Lingah sedimentary rocks are more largely developed than in Hormuz. At these places thick beds of a pink sandstone are the prevailing type. Interbedded with them are trachytes, ash beds, and gypsum. At both Khamir and Bestánah a rhyolite occurs, which is in a very decomposed condition. Included within it are fragments of limestone, pre sumably Cretaceous, as it rests on Hippuritic beds, and the whole mass is permeated by sulphur, which has at various times been com mercially worked. In addition to the rocks which have already been mentioned as occurring in the Hormuz series, there are also beds of chert or jasper. A glistening white rock of this nature crops out in two high peaks in the island of Hormuz. These have been thought by many persons to consist of salt, no doubt on account of their proximity to such large masses of salt as exist in Hormuz. The jasper is more or less de composed. Similar beds are found in nearly all the islands on which this series is found. In Henjám there is an outcrop of a cherty rock having a cellular structure, the cavities of which contain the partially decomposed remains of what evidently was once a volcanic rock. In the portions of the outcrop which have been exposed to the weather this softer volcanic stuff has been removed, leaving the secondary quartz, which has been hard enough to withstand the weather, with its chambers empty.. 6. Eocene. Rocks of this age occur in three distinct areas, in each of which the lithological facies is different, which seems to mark them off as separate areas of deposition. These three areas are— I. Persia. 2. 'Omán. 3. Bahrain, C im
