OF THE CARBONIFEROUS SERIES. 627 



Maximum thickness. 



feet. 



Stage G. Upper Coal-measures.— -Shales, sandstones, and limestones oH ,/.«„ 



Ardwick, with Spirorbis, Cythere, and fish. A bed of black-band I , 



to 

 rnnwpsii. joeiow tnese rea sandstones, | ( 



shales, and thin coal-seams* 



ironstone, with Anthracosia Phillipsii. Below these red sandstones, f 



1400 



to 



2000 



Stage F. [Middle] Coal-measures. — Sandstones, shales, clays, and thick j 3000 

 coal-seams, from ihe " Worsley Four-feet coal " to the flags below the I to 

 Arley mine. Anthracosia, Anthracomya, &c J 4000 



Stage E. Gannister Beds. — Flagstones, shales, and thin coal-seams, one" 

 of which has a hard siliceous floor (Gannister). Goniatites Listen, 

 Nautilus, Aviculopecten papyraceus, Lingula squamiformis, Anthra- 

 cosia, Spirorbis, fish, &c 



Stage J). Millstone Grit. — Coarse grits, flags, and shales, with a few thin 1 3500 

 coals. Marine shells: Aviculopecten, Posidonomya Gibsoni, Goniatites I to 

 reticulatus, Orthoceras, &c J 5000 



Stage C. YoredaJe Beds. — Shales principally, with thick beds of grit in 1 2000 

 the centre (Yoredale grit). Goniatites excavatus and several other I to 

 species, Modiola, Myalina, Discina nitida, Productus J 4000 



Stage B. — Carboniferous Limestone, &c. 



(2) Yorkshire and Derbyshire Districts. 



feet. 

 Stage G. Upper Coal-measures. — Reddish sandstones, with plants (Ack- 

 worth rock), and " red rock of Rotherham " resting unconformably 

 onStageFt 54 



Stage F. Middle Coal-measures. — Sandstones, shales, clays, with iron- 

 stones and coal-seams. Anthracosia &c. ; fish 2500 



Stage E. Lower {or Gannister) Beds. — Flagstones and shales, with thin 

 coals, and Gannister-floor. Aviculopecten papyraceus, Goniatites, 

 Posidonomya, Crthoceras Steinhaueri, Nautilus Bawsoni 1000 



Stage D. Millstone Grit. — Coarse grits, flags and shales 2000 



Stage C. Yoredale Beds — Principally shales, with grit in centre. Ma- 

 rine fossils 2000 



Stage B. — Carboniferous Limestone about 5000 



Base not seen. 



(3) North- Staffordshire District. 



feet. 

 Stage G. Upper Coal-measures. — Brown and reddish sandstones, red and 

 mottled clays, and shales, thin coals and ironstones down to the " red 

 mine "-band. A bed of limestone at Fenton, with Spirorbis carbo- 

 narius, and Anthracomya Phillipsii (Shelton) 1 500 



* Marine shells occur in a band in this position at Ashton-under-Lyne — Avicido- 

 pecten fibrillosas (Salter), Ctenodonta, Goniatites, Nautilus precox (Salter), Dis- 

 cites rotifer (Salter). These were discovered by my colleague, Prof. A. H, Green ; 

 see ' Geology of Oldham,' Mem. Geol. Survey. 



t Assuming that the " Ackworth rock " is the " red rock of Rotherham," 

 which Mr. Aveline describes as unconformable to the Coal-measures underneath. 

 The plants are Lepidodendron acideatum, L. obovatum ?, Catamites Suckovii, and 

 Sigillaria, as determined by the late Mr. Salter, " Geology of Parts of Notts, 

 York, and Derby," by W. T. Aveline, F.G.S., Mem. Geol. Survey (1861). 



