﻿part 3] 



VOLCANIC HOCKS OF MOZAMBIQUE. 



225 



The prevailing dip is southward or south-eastward, except north 

 of Mokambo Bay, where the Conducia Beds' appear to be brought, 

 up by a syncline. Folding, however, wherever seen, is very gentle. 

 Evidences of movements of a vertical type are more common, and 

 small north-and-south faults have broken up the Monapo Beds 

 along the northern shores of Mokambo Bay. Mr. Wayland deter- 

 mined their junction with the gneissose rocks on the west to be a 

 faulted one. Tbe Conducia Beds south of Sokoto Hill are faulted 

 against the gneissose rocks, for the conglomerate basement-beds 

 are not seen, and marine limestones are brought to a level with 

 the older rocks. Mr. Wray considers that Fernao Velloso Harbour, 

 with its rugged gneissose cliffs on the west and low-lying limestones, 

 and shales on the east, represents a line of fault picked out by marine 

 erosion between the Cretaceous sediments and the Pre-Cambrian 

 complex. On linking up all our observations, it seems clear that 

 a series of nearly north-and-south faults has slowly displaced the 

 Cretaceous beds, generally dropping them down on the eastern side, 

 and locally cutting them off sharply from the ancient rocks beyond. 

 It is a significant feature that the average direction of these faults 

 is parallel to the general trend of the adjoining coast-line and to the 

 basaltic dykes associated with the Tertiary volcanic rocks. The 

 strike of the foliation and banding of the gneisses is truncated 

 obliquely by the coastal belt, and the coast has therefore a typically 

 Atlantic character. 



IV. Bibliography. 



1879. A. Sadebeck. — ' Geologie von Ost-Afrika ' in Von der Decken's ' Keisen in 



Ost-Afrika.' Leipzig, vol. iii, pp. 35, 36. 

 1882. C. Maples. — 'Makua Land, between the Rivers Rovuma & Luli ' Proc. 



Roy. Geogv. Soc. vol. iv, p. 79 ; map on p. 128. 

 1882. H. E. O'Neill. — ' A Three Months' Journey in the Makua & Lomwe 



Countries ' Proc. Roy. Geogr. Soc. vol. iv, p. 193. 



1884. H. E. O'Neill. — 'Journey from Mozambique to Lakes Shirvva & Amaramba' 



Proc. Roy. Geogr. Soc. vol. vi, pp. 632, 713. 



1885. H. E. O'Neill. — ' Eastern Africa between tbe Zambesi & Rovuma Rivers ' 



Proc. Roy. (ieogr. Soc. vol. vii, p. 430 and Scot. Geogr. Mag. vol. i, p. 337. 

 1887. J. T. Last. — 'On the Society's Expedition to the Namuli Hills' Proc. 



Roy. Geogr. Soc. vol. ix, p. 467 ; map on p. 212. 

 1900. P. Choffat. — -'Sur le Cretacique Superieur a Mozambique' C. R. Acad. Sci. 



Paris, vol. cxxxi, p. 1258. 

 1903. P. Choffat. — 'Contributions a la Connaissance Geologique des Colonies 



Portugaises de l'Afrique : le Cretacique de Conducia ' Comm. Serv. Geol. 



Portugal. 



1912. A. Holmes & D. A. Wray. — 'Outlines of the Geology of Mozambique' 



Geol. Mag. dec. 5, vol. ix, p. 412. 



1913. R. L. Reid. — -'Notes on Mozambique Exploration' Geogr. Journ. vol. xlii, 



p. 44 ; map on p. 112. 



1913. A. Holmes & D. A . Wkay.— Mozambique : a Geographical Study' (with 



map). Geogr. Journ. vol. xlii, p. 143. 



1914. A. Holmes.— "The Lateritic Deposits of Mozambique' Geol. Mag. dec. 6, 



vol. i, pp. 529-37. 



1915. E. J . Wayland. — ' Notes on the Occurrence of Stone Implements in Mozam- 



bique ' (with map). ' Man,' vol. xv, p. 57. 

 1915. D. A. Wray. — 'Observations sur la ' < ieologie du District de Mozambique ' 



(with sketch-map). Comm. Serv. Geol. Portugal, vol. xi, pp. 69-84. 

 1917. A. Holmes. — (a) Picrite from the Ampwihi River, Mozambique' Geol. Mag. 



dec. 6, vol. iv, p. 150; (b) 'Tbe Pre-Cambrian & Associated Rocks of tin; 



District of Mozambique' Abs. Proc. Geol. Soc. no. 1010, p. 89; & Geol. 



Mag. dec. 6, vol. iv, p. 380. 



