170 Dr. L. F. S2Jath — Lower Lias A'intnonites from SJcye. 



until near the Barue border a series of basaltic lavas are met with 

 emerging from beneath them. Messrs. Teale and Wilson long ago 

 referred to these, but though they do not definitely correlate them 

 with the Lupata Volcanics, they were evidently disposed to do so. 

 As a matter of fact, the Lupata Volcanics die out in a most remark- 

 able way only about 20 miles south of the Zambesi, as indicated by 

 the disappearance of the marked feature they make when looking 

 across country. Their position is, however, clearly indicated in the 

 course of the traverses referred to by the sudden disappearance of 

 the pebbles derived from them, which are very conspicuous in the 

 Cretaceous beds, but are, of course, absent from the Lupata sand- 

 stones. An extensive area of these is crossed before reaching the 

 basalts, which emerge from beneath them with a gentle easterly 

 dip, a fact which places their age beyond question and is entirely 

 confirmed by their lithological character, even though they are of 

 more varied types than usual. They form a belt about 7 or 8 miles 

 across, paitly flat country, but their western edge rises into a scarp 

 several hundred feet in height, breached by Several rivers, of which 

 the Hata affords a particularly good section. The number of flows 

 is evidently considerable and the thickness of the series greater than 

 at Tete, while much more variety is seen in the colour, texture, etc., 

 of the lavas. There are masses and beds of agglomerate at several 

 points ; some of the former no doubt indicate vents. The volcanics 

 must stretch a hundred miles from north to south ; their southern 

 termination appears to be near the great mountain mass of 

 Gorongoza, and northward they may even connect with those of the 

 Tete area. Inside the Barue boundary the underlying sandstones 

 are well seen, an interesting point, as they are completely obscured 

 by alluvium near the Lupata Gorge. They are very varied in 

 character, a common type being arkose-like, with pink felspars. 

 A single narrow band is fine-grained, and pale-buff in colour ; this 

 is the only stratum seen at all reminiscent of the Forest Sandstones- 

 of Rhodesia. A feature of the locality is the large number of dolerite 

 dykes by which the sandstones are intersected and the remarka-ble 

 metamorphism of the latter in their vicinity. These are frequently 

 converted into rocks indistinguishable in the field from a pinkish 

 granite, for which they were indeed mistaken until clearly seen 

 in situ. 



On Lower Lias Ammonites from Skye. 



By Dr. L. F. Spath. 



rFHE writer has thought it desirable, in the following observations, 

 -*- to embody the results of his examination, last September, 

 of the ^rm'oceras-bearing beds of Ardnish, near Broadford in Skye. 

 The strata yielded a number of Ammonites of the Upper Coroniceras, 

 gmuendensis, and jEtomoceras subzones, and belong chiefly to the 

 " Shaly Beds " of division iv of the Broadford Beds of the Survey 



