Zoological Society. 503 



are exhibited in detailed sections, of whicli it is very difficult to 

 convey a notion in a mere abstract ; and the works carried on 

 within them are, with very limited exceptions, referred to the 

 upper division of the Whitehaven field. 



The coal bands exhibited in the works near Gillerux, Aspatria, 

 Plumland, and Weary Hail are then described ; and detailed sections 

 are given of the works in the Bolton field, — generally regarded as the 

 north-eastern limit. There is, however, an unexplored tract to the 

 east of a great fault which forms the northern limit of the Bolton 

 field ; and, in the neighbourhood of Rosley, a seven-feet coal; un- 

 doubtedly a member of the upper division) was formerly worked) 

 though to a very small extent, in consequence of the complicated 

 dislocations which intersect the district. 



Having described, in the above order, the several portions of the 

 great coal-field, and noticed some of its peculiarities of mineral struc- 

 ture, the authors endeavour to ascertain the limits of certain outlying 

 masses of the lower red sandstone, of the magnesian conglomerate , and 

 of the new red sandstone. From the facts stated, it appears that the 

 coal measures pass, in some instances, in regular ascending order, 

 into the lower red sandstone. In other instances, however, the coal 

 measures appear to have undergone considerable movements of ele- 

 vation before the existence of the lower red sandstone; in as much 

 as the position of the two formations is discordant. Again, though 

 the lower red sandstone forms the natural and immediate basis of 

 the magnesian limestone and conglomerates, yet there are several 

 places, within the south-western limits of the country described, 

 where the conglomerates appear to have been deposited in hollows 

 and inequalities presented by the waterworn beds on which they 

 rest unconformably. From which facts it seems to follow, that the 

 formations described in this paper have undergone, during their de- 

 velopment, two considerable movements, affecting the position of the 

 component strata: 1st, a partial movement of the coal measures, 

 anterior to the deposition of the lower red sandstone ; 2ndly, a par- 

 tial movement, both of the coal measures and the lower red sand- 

 stone, anterior to the formation of the magnesian conglomerates. 



This being the last evening of the Session, the Society adjourned, 

 at its close, to Wednesday, November the 2nd. 



ZOOLOGICAL SOCIETY. 



May 10. — The following Note by the Rev. H. Dugmore was read. 



" Lieut. Col. Mason, of Neeton Hall (four miles from Swaffliam), 

 has had a Sea Eagle, HaUceetus albicilla, Sav., in confinement for the 

 last sixteen years. About a month since, it dropped an egg, which 

 is now in my collection. The egg is perfectly white, and not quite 

 so large as that of a Goose : the shell is rather harder." 



A letter was read from Capt. Green of Buckden, Huntingdonshire, 

 descriptive of a verj' fine specimen of the ham-door Hen in his pos- 

 session, which has assumed the Cock plumage : the change took place 

 about three years ago. The bird has since been presented to the 

 Society by the writer. 



