Geological Society of London. 43 



(h) Agglomerates and breccias found along coast-lines and fault- 

 terraces, always at the foot of the fault-terraces, or along the lower 

 slopes of the depressed areas : these accumulations are either sub- 

 merged or lie at the water-line. Their materials are much water- 

 worn, and land-shells are contained in many of the layers. The 

 agglomerates are in many cases distinctly stratified ; and the author 

 concludes that the materials appear to have been swept down, durino- 

 heavy rainfall, into the waters of land-locked creeks. 



(c) Ossiferous deposits of caves and fissures, which have been 

 described elsewhei'e. 



2. " Geological Notes of a Journey in Madagascar." By the Eev. 

 E. Baron, F.L.S., F.G.S. 



The part of the island travelled over may be divided into four 

 sections. 



(a) Antananarivo to the East Coast. — The principal rock is a 

 hornblende granitite-gneiss, but there is also much norite usually 

 containing olivine. The general strike of gneiss and norite along 

 this region is north-west and south-east, or north-north-west and 

 south-south-east. The country is traversed by several large dolerite- 

 dykes. 



(6) The Northern Part of the East Coast. — Dolerite-flows pre- 

 dominate along the coast, and from their character are believed to 

 have flowed from such fissures as are indicated by the dolerite-dykes 

 noted in the preceding section. Some felsites, probably lavas, and 

 felsitic breccias were also observed ; also a granitite penetrated 

 by epidiorites, and associated with chiastolite-slates. Many other 

 rocks, schists, and eruptives were found. 



(c) The Northern End.— ^edL\mQnia.Ty I'ockB (sandstones and lime- 

 stones) are extensively developed in this section, as well as much 

 volcanic material. The sediments are of Jurassic and Cretaceous 

 ages. The volcano Ambohitra is situated on these sediments, and 

 has poured out olivine-basalts. Shells of recent species occur on the 

 mountain-chain at the northern end. 



{d) The North-icestern Coast and Islands. — Marine strata of 

 Jurassic, Cretaceous, and Eocene ages are found in this area, 

 together with various igneous rocks including trachyte, foyaite, 

 nepheline-phonolite, hauyne-nepheline-phonolite, andesite, and 

 basalt. South-west of Auorontsanga are four islands — three com- 

 posed of volcanic rocks, and the fourth, Antanifaly, of nummulitic 

 limestone. 



3. " On a Collection of Fossils from Madagascar obtained by the 

 Eev. E. Baron." By E. BuUen Newton, Esq., F.G.S. 



The fossils forming the subject of this paper were collected in 

 the northern part of the island. The author gives an account of 

 the previous work on the fossils of Madagascar ; this is followed by 

 a description of the post- Tertiary, Tertiary, Cretaceous, and Jurassic 

 fossils. The post-Tertiary fossils are for the most part terrestrial 

 shells found on Ambohimarina hill, mainly of species still existing 

 on the island. A few marine forms have been found elsewhere. 

 A description of species, many of them new, follows ; and the 



