On some Natural Casts of Foot-prints from the Wealden. 325 



as regular constituents of the crust of the earth, and especially in cer- 

 tain parts of the Scottish Highlands, as illustrated by sections observed 

 by himself. These he correlated with what is seen in other parts of 

 the Highlands. 



Contrasting his published sections with the corresponding ones 

 given by Sir R. I. Murchison and Mr. Geikie, he observes that, 

 though represented as maintaining the identity of the gneiss of 

 the west coast with certain mica- or chlorite-slates, yet he has 

 in former papers, and in his published map, always regarded 

 them as being identical only so far as both belong to the great series 

 of metamorphic formations inferior to the red sandstone and quartz- 

 ite, but still as distinct formations with peculiar features, and, it may 

 be, of widely different age. 



8. " On some Natural Casts of Foot-prints from the Wealden of the 

 Isle of Wight, and of Swanage." By S. H. Beckles, Esq., F.R.S., 

 F.G.S. 7 



Some of these natural casts are nearly 3 \ feet long, indicating 

 not merely the imprints of the toes, but also of the sloping meta- 

 tarsals. The animal must have been of great size and weight, 

 leaving deep imprints. Little trifid imprints of only 3 inches in 

 length, with a stride of about 13 inches, occurred to the author also 

 in the Jsle of Wight. He has found, also, trifids of the usual size in 

 the Wealden of Swanage Bay. Mr. Beckles argued that other 

 Dinosaurians besides the Iguanodon have left these track-marks ; 

 and he stated that from the first he has been accustomed to asso- 

 ciate them with the various phalangeal bones so abundant in the 

 Wealden. 



9. " Geological Notes on Zanzibar/ 5 By Richard Thornton, Esq. 

 In a letter to Sir R. I. Murchison, F.R.S., F.G.S. 



From the coast to the coast-range (600 to 1300 feet high), the 

 country consists of a series of strata with an easterly dip, namely 

 (from above downwards) coral-limestone, sandstone, yellow shale, 

 and sandstone with plant-remains. The mountain Kilimanjaro is 

 formed chiefly of volcanic rocks. White and altered sandstones, 

 with easterly dip, are met with also in the Massai Plain. 



10. " On a Section at Junction-road, Leith." By W. Carruthers, 

 Esq., F.L.S. 



The author stated that in the section of clay, sand, and gravel 

 near Leith, described by Mr. Geikie as part of a raised beach 

 elevated since the period of the Roman occupation, not only have 

 mediaeval pottery and tobacco-pipes been found in the pottery- 

 bearing deposit described by Mr. Geikie, but a mediaeval jar has 

 been met with in the sand beneath. The so-called " Roman" pot- 

 terv was stated bv the author to be of mediaeval acre, on the inde- 

 pendent authority of Messrs. Birch and Franks, of the British 

 Museum ; and he believes that the beds in question are mainly of 

 late and artificial formation ; he does not, however, argue from this 

 that there is no evidence of a late upheaval of the central part of 

 Scotland. 



