v MOUNT SEATURA 67 



basalts with scanty olivine, a little interstitial glass, and belonging 

 to the porphyritic and non-porphyritic sub-genera of genus 25 of 

 the olivine-rocks : (J?) grey olivine-basalts with porphyritic opaque 

 plagioclase, containing but little residual glass, but varying greatly 

 in the amount of olivine and belonging to the genera 2 and 26 of 

 the olivine-basalts ; they would be classed, as far as appearance 

 goes, as porphyrites ; their specific gravity ranges 2*85 to 2*90. 

 The rock exposures were, however, scanty ; and but little infor- 

 mation could be obtained of the mode of occurrence. No 

 scoriaceous rocks were found except in the instance of a compact 

 dark basalt without plagioclase phenocrysts, apparently a dyke 

 rock, and belonging to genus 40 of the olivine-basalts. 



(e) Ascent to the Summit of Seatura from Ndriti. — The town of 

 Ndriti lies in the great gap in the south-west side of the mountain 

 which has been previously mentioned as probably an old crateral 

 cavity. After traversing a district of highly altered basic rocks 

 or propylites, to be subsequently described, and reaching an 

 elevation of about 400 feet above the sea, I came to the long 

 slope that leads up to the summit. A dense forest hid every- 

 thing from view, so that the compass and aneroid had alone 

 to be relied on. 



At first one traversed a series of step-like alternations of level 

 ground and steep " rises," until the old site of the village of Seatura, 

 about 1,200 feet above the sea, was reached. There are some 

 strange legends connected with this old mountain-village, which is 

 now only indicated by little piles of stones and the debris of a wall, 

 and was evidently abandoned long ago. We finally reached the 

 summit by following up a spur or ridge in a northerly direction 

 from Seatura. There was a precipitous descent on either side of the 

 ridge with evidently a broad, deep valley to the eastward. The 

 summit was rounded ; but on account of the forest no view could 

 be obtained. There was never any extensive exposure of rock 

 noticed during the ascent ; but all the way up occasional small 

 blocks of a blackish olivine-basalt were observed on the surface, of 

 the same general type as that found all around the mountain and 

 referred to genus 37 in the synopsis. 



(f) The Ndriti Basin or Gap. — This great hollow in the side of 

 Seatura, which I have named after the town in its midst, is appar- 

 ently a crateral cavity now drained by the Ndama river, and its 

 tributaries, and covered with dense forest to such a degree that a 

 general view of the whole is impracticable. The glimpses, however, 

 that one obtains of the mountain scenery are very grand, the town 



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