404 BIBLIOGRAPHY OF 1 884: GEOLOGY AND PAL/EONTOLOGY. 



George Varty S:\nTH. Cumberland 

 On Further Discoveries of Footprints of Vertebrate Animals in the Lower New 

 Eed Sandstone of Penrith. Quart. Journ. Geol. Soc, August, xl. 479-481, 

 and woodcut ; Geol. Mag., July, p. 336. 



These valuable as coming from undoubtedly Lower Permian strata, in which 

 remains of vertebrate forms higher than fishes had so rarely occurred. 



H. B. Stocks. Yorkshire. 

 On the Composition of the Coal Balls and Baum Pots in the Lower Coal 

 Measures. Proc. Yorks. Geol. and Polytech. Soc, N.S., vol. viii., Part III., 

 P- 393. 



Explanation of the terms 'Coal Ball' and 'Baum Pot,' with analyses of 

 specimens of the same obtained from Bradshaw, Stocks' Pit, and Swan Bank, 

 near Halifax. 



J. J. Harris Teall. Cumberland. 

 A Faulted Slate. Geol. Mag., January, New Series, Decade III., vol. i., 

 pp. 1-3, and plate i. 



The photograph represents a piece of faulted slate from the Borrowdale 

 series in the English Lake district, and exhibits every detail of the faulting in a 

 perfect manner. Examples of a number of typical trough faults most beauti- 

 fully shown, and explanations of same given in detail. 



J. J. Harris Teall. Northumberland. 

 Dr. J. Petersen on some Cheviot Eocks. Geol. Mag., May, New Series. 

 Decade III., vol. i., pp. 226-234. 



Petrology of a rock named as enstatite-porphyrite by Dr. Petersen, the term 

 ' enstatite ' being selected as the representative of the entire group of rhombic 

 pyroxenes, and the term poq^hyrite being given to the rock because it is of 

 Pre-Tertiary age. 



J. J. ILiRRis Teall. Northumberland, Durham, Yorkshire. 



Petrological Notes on some North of England Dykes. Quart. Journ. Geol. Soc, 

 xl. 209-247, plates xii., xiii.; Geol. Mag., February, New Series, Decade III., 

 vol. i., p. 92 ; and abstract in Proc. Geol. Soc, December 19th, 1883. 



Full petrological details, with microscopical and chemical analyses, are 

 given respecting the following North-country Dykes : — The Cleveland, Cock- 

 field, and Armathwaite Dyke ; the Hett and related dykes, the Hebburn 

 Dyke (which Mr. Teall regards as distinct from that of Coley Hill), the Tyne- 

 mouth Dyke (which he thinks identical with the Coley Hill Dyke), the 

 Brunton Dyke, the Seaton and Hartley Dykes, the Morpeth Dyke, the Higk 

 Green Dykes, the Acklington Dyke. 



The great Cleveland I)yke is traced to Armathwaite in the Eden Valley ; 

 it is an augite-andesite, probably of Miocene age ; it has no connection with 

 the Whin Sill. The Bibliography of the subject is given. 



J. J. Harris Teall. Northumberland, Durham. 



On the Chemical and Microscopical Characters of the Whin Sill. Quart. Journ. 

 Geol. Soc, vol. xl., pp. 640-657, plate xxix.; Geol. Mag., August, New Series, 

 Decade HI., vol. i., pp. 380, 381. 



A detailed paper, giving very fully the petrological characters of the Great 

 Whin Sill, from original observation both in the field and in the laboratory. 

 The absence of olivine in the rock is one of its most striking peculiai'ities, and 

 it is shown to be rather a diabase, like some known in Sweden and in the 

 Atlantic States of North America, than a true basalt. The author regards 

 the intrusive nature of the Whin Sill as no longer requiring proof. 



The felspar of this well-known rock is shown to give an analysis agreeing 

 with that of andesine ; the dominant pyroxene is monoclinic, but with the com- 

 position of enstatite ; the other chief constituent seems to be an intergrowth 

 of magnetite and ilmenite. The Bibliography of the subject is given. 



Naturalist, 



