800 THE JOURNAL OF GEOLOGY. 



little west of north of the Monastery the ridge of Mt. Chondos is 

 made up of rounded masses of andesite which split up into more 

 or less perfect concentric shells on hammering (perhaps an effect 

 of weathering 1 ), and which are cemented by a paste of the same 

 material. Almost due north of the Monastery the top of the 

 ridge has quite the appearance of a lava stream of the type that 

 one sees at Giorgio Kaimeni in Santorini, being composed of 

 sharp, angular blocks tumbled together in great confusion. 



The southern ridge, called Mt. Dendros (Tree Mountain) is 

 much shorter, ending at the east in a peak on which stands 

 another chapel to St. Dimitrios. It then bends round to the 

 southeast, enclosing, with Mt. Chondos, a small fertile plain in 

 the northwest corner of which stands the Monastery of the Pana- 

 gia (Holy Virgin). This plain, which is roughly triangular in 

 shape, is bounded on the east by a ridge which bears the name 

 of Mt. Kouragio, to be described presently. The plain is drained 

 by a stream flowing through a deep valley in its northwest angle. 

 Although at first glance it looks as if this Monastery plain were 

 the site of an ancient crater, yet closer examination of the region 

 fails to confirm this impression. 



The branch of Mt. Dendros which bounds the plain on the 

 south is called Mt. Gaiapha and has a height above sea level 

 estimated at 500 metres. The inner (north) side of this is very 

 steep, a mound of talus below and steep cliffs above, the rock 

 being split by vertical cracks running southwest and northeast. 

 The rock is a light reddish hornblende-augite-andesite carrying 

 many of the segregations to be described later. It weathers very 

 easily and is hollowed on the northern face into caves and pockets, 

 some of which are two metres across. The southern slopes are 

 covered with angular blocks and overgrown with grass, thyme, 

 and scrub-oak. 



The ridge which bounds the Monastery plain on the east 

 bears the name of Mt. Kouragio, though here as in so many 

 other places the mountain peaks and ridges do not possess very 

 definite names and are often called by different names by differ- 



J Cf. Reyer, Die Enganeen, Wien, 1877, p. 20. 



