642 MR. H. BOLTON, F.E.s.E., ON [Juno, 1904. 



of the Asliton Moss Pit, when sinking operations were 

 proceeding between the 400 and 500 yard levels. These 

 are tabulated in a special column, as it is impossible to fix 

 their horizon with accuracy. 



Range in Time. 



Whilst in the case of the Lower Coal Measures, the 

 moUusca were the dominant forms, both in numbers and 

 species, the Middle series show an even more pronounced 

 development of fishes. 



The highest division of animal life represented is the 

 amphibia. The late Mr. George "Wild collected rib 

 fragments and vertebrae, of a distinctly amphibian character, 

 from the Thin Bed of Fulledge, the Bastard Cannel of 

 Cliviger, and the Two Feet Mine of Bardsley. 



Taking the coalfield as a whole, it may be said that fish 

 remains are equally abundant from the Arley Mine to the 

 Worsley and Pendleton four-feet mines. 



This does not seem to be the case in the various districts. 



In the Burnley district, fish remains are mainly confined 

 to the lower seams and are very scanty above the Californian 

 or Thin Bed. 



Fish remains in the Oldham district are fairly generally 

 distributed, no seam showing such a preponderance as is seen 

 in the case of the Arley and Thin seams at Burnley. 



In the Wigan and Bolton districts, fish remains are mainly 

 restricted to the Cannel, and the Pendleton and Worsley 

 four-feet mines. 



Cephalopoda and Brachiopoda are entirely restricted to 

 the Marine Band. 



The Bolton and Oldham districts are aKke in the occurrence 

 of rare forms of Crustacea and Myriopoda. 



