UPPER COAL MEASURES NEAR MANCHESTER. 



87 



New Red Sandstone and variegated marls {un- 

 conformable to the strata below) 



Limestone... 



Red and green argillaceous shelly marls 



Limestone 



Red and green mavis 



Limestone (occasional) 



Marls and shale r , &c, with calcareous courses 



Limestone 



Shale, &c 



Coal and bass 



Sandy shale 



Main or great-mine limestone 



Red marls with calcareous bands 



Coal 



Grit or great red rock, with micaceous marls 

 and Uniones 



ft. in. 



4 0 



15 0 



3 0 



24 0 



1 0 



15 0 



1 6 



45 0 



9 0 



60 0 



1 4 



81 0 



Coal 





10 





216 



0 





150 



0 



Berwick red rock (finely laminated and mica- 









54 



0 



Shale 



12 



0 





2 



3^ 



Aqueduct rock. 







Below the aqueduct rock the descending section exhibits 

 a great development of red grits, alternating with coal seams 

 in the following order. 



ft. in. 



Coal 0 10n 



Rocks, &c 131 0 



Fitzgerald's coal 2 0 



Rocks of grit, &c 210 



Coal (three-quarter) 2 



Rocks 57 



Coal (Buckleys) 4 



Rocks 120 



Yard coal, shells and Cypris in roof...... 3 



Rocks, &c 60 



Coal 2 



Rocks 129 



Doctor coal 1 



Rocks 33 



Coal 2 



Rocks 126 



Coal 0 10 



Rocks 68 0 



Coal 0 8. 



n 



0 

 3 

 0 

 0 

 0 



0 K 



Average specimens of the great mine or upper coal limestone at Ardwick, and the adjacent mag- 

 nesian limestone at Collyhurst., having, at the request of Professor Phillips, been analysed by- 

 Mr. H. C. Campbell, have given the following results 2 . 



Carbonate of Lime 



Carbonate of Magnesia 



Alumina 



Oxide of Iron 



Loss 



Ardwick, 

 . 84 . 



2 



4 . 



5 . 

 5 . 



Collyhurst. 

 .. 60 



24 

 4 

 3 



100 



100 



To Mr. Williamson's account of the Ardwick Limestone, Professor Phillips in the letter above 

 alluded to adds the remark, that the sections at different spots give different results as to the number 

 of beds of limestone ; — thus, in one shaft at Ardwick the place of the four-foot lime of the above 

 section is merely traceable, there being only three limestones above the main band ; while in another 

 pit, calcareous matter intervenes below the half-yard mine, at a depth at which in other works, the 



1 Most of the red and green marls, shale, &c., of this section are described by Mr. Williamson as " Chinch," 

 the local term of the miners. Few of them, I believe, are, strictly speaking, marls. In a section drawn by 

 Mr. Binney, and furnished me by Mr. Leigh, seven courses of limestone are marked. 



3 The chemical properties of the Ardwick limestone were thoroughly understood by the late celebrated and 

 lamented Dr. Henry. 



L 2 



