375 

 MARINE BANDS IN THE YORKSHIRE 

 COAL MEASURES.* 



H. CULPIN. 



(plate XVI,). 



As the result of examinations of the ground gone through 

 recently in sinkings to the Barnsley coal in the neighbourhood 

 of Doncaster, four marine bands can be added to the list of five 

 marine bands hitherto recorded in the Yorkshire Coal Measures. 



The five bands previously known are — {a) the one with 

 Pectens, Posidonomya and Goniatites, which occurs in connection 

 with the thin coal lying on the Rough Rock of the Millstone 

 Grit ; {b) the Pecten bed, with pectens and cephalopods, which 

 forms the roof of the Canister or Hard Bed Coal, about 80 feet 

 above the Millstone Grit ; (c) a Lingula bed about 80 feet above 

 the Silkstone Coal ; {d) the ' Aviculopeden ' [Pterinopecten) 

 bed below the Ackworth Rock ; and {e) a Posidonomya bed 

 seen at Frickley Hall in measures above the Ackworth Rock. 



The following is a summary of the positions of the four 

 recently discovered marine bands, and of the previously known 

 ' Aviculopeden ' [Pterinopeden) bed below the Ackworth Rock, 

 as observed at Brodsworth, 4 miles north-west of Doncaster ; 

 at Bentley, 2| miles east of Brodsworth ; and at Maltby, 10 

 miles south of Brodsworth. The particulars as to Maltby are 

 inserted through the kindness of Mr. W. H. Dyson, the Engineer 

 in charge there, who has paid special attention, with remarkable 

 success, to the marine and other fossils met with. The figures 

 are stated in feet above the Barnsley Seam. 



MARINE BANDS. 



Height in Feet above Barnsley Coal. 



' Aviculopeden ' [Pterinopecten) 

 bed, below the Ackworth Rock 

 Marine Band with Limestone base 

 Marine Band [Lingula) 

 Marine Band above Cannel Coal . . 

 Marine Band [Lingula) 



The band about 700 feet above the Barnsley Coal is 

 the most important one of the new series, and its distinctive 

 characteristics make it an excellent datum line, easy of recog- 



* Read at the meeting; of the British Association at Sheffield, Sept., 1910. 

 igio Oct. I. 



