180 



CARBONIFEROUS LAMELLIBRAXCHIATA. 



horizons. Isodietic lines, therefore, in no way indicate time, but simply physio- 

 graphical conditions, and in this sense are also life-zones. 



A table which I published in the ' Proc. Yorks. Geol. and Poly. Soc.,' vol. xiv, 

 p. 443, and which I reprint here, shows the actual amount of detrital and organic 

 deposits in six localities between Ingleborongh and Fife. This table wonld have 

 been more marked if I had included 2000 to 3000 feet of practically unbroken lime- 

 stone deposit in Derbyshire. 



I. 



II. 



III. 



IV. 



V. 



VI. 



Ingleborough. 



Wenslet and 



Weabdale and 



North North- 



West of Scot- 



East op Scotland. 



Swale Dales. 



Alston Moor. 



umberland. 



land. 



Fife. 



Main Limestone, 



Red Beds or Crow 



Fell Top Lime- 



Upper Fell Top, 



Linnspout or Cas- 



Upper Group, 1000 



60 feet. 



Limestone. 



stone, 4 j feet. 



20 feet. 



tle Cary Lime- 



feet, with 10 to 



Middle Lime- 



Little Limestone. 



Little Limestone, 



Lower Fell Top, 



stone, 36 feet. 



28 feet limestone. 



stone, 20 feet. 



Main Limestone, 



6 feet. 



6 feet. 



Lower Posts, 36 



Middle Group, 



S i m o n ds tone 



60 feet. 



Great or Main 



Limestone, 14 



feet. 



Sandstones, 



Limestone, 30 



Underset Lime- 



Limestone, 63 



feet. 



Arden or Calmy 



Shales, Fireclays, 



feet. 



stone, 20 feet. 



feet. 



Dryburn Lime- 



Limestone, 15 



and Coals, 1000 



Hardraw Scar 



3 yards Lime- 



4 fathom Lime- 



stone, or lOyards 



feet. 



feet. 



Limestone, 40 



stone, ? 6 feet. 



stone, 24 feet. 



or Ebbs' Nook 



Highfield or Index 



Lower Group, 



feet. 



5 yards Lime- 



3 yards Lime- 



Limestone, 30 



Limestone, 6 



Hosie and Hur- 



Great Scar Lime- 



stone, 9 feet. 



stone, 9 feet. 



feet. 



feet. 



let Limestones, 



stone, 600 feet. 



Middle Lime- 



5 yards Lime- 



Denwick : Low 



Middle Sand- 



250 feet, with 26 



Basement beds. 



stone, 30 feet. 



stone, 15 feet. 



Dene, or 8 yards, 



stones, Shales 



to 53 feet lime- 



Total, 1590 feet, 



S imondstone 



Scar Limestone, 



28 feet. 



with Coals and 



stone. 



of which 750 



Limestone, 20 



30 feet. 



Acre or 6 yards, 



Ironstones, 600 



Calciferous Sand- 



feet are lime- 



to 30 feet. 



Cockleshell Lime- 



22 feet. 



feet. 



stone Series, 3800 



stone. 



Hardraw Scar 



stone, 14 feet. 



Thin Limestone, 



Kingshaw and 



feet, with 50 feet 





Limestone, 50 



Tyne Bottom 



2 feet. 



Kerrsland Glen 



marine lime- 





feet. 



Limestone, 24 



Thin Limestone, 



Limestone, 7 



stones. 





Gayle Limestone. 



feet. 



8 feet. 



feet. 







Great Scar Lime- 



Jew Limestone, 



Eelwell and Main 



Hosie Limestone, 



Note.— Passing- 





stone, 500 feet. 



24 feet. 



or 9 yards 27 



4 feet. 



east in the Car- 





Basement beds, 



Little Limestone, 



feet. 



Hurlet, Beith, 



luke district the 





10 feet. 



15 feet. 



Several Thin 



Macdonald, or 



limestones of the 





Total, about 1600 



Smiddy Lime- 



Limestones. 



Howrat, 100 to 



Upper and Lower 





feet, of which 



stone, 31 feet. 



Oxford, or 5 yards 



60 feet. 



Divisions thin 





750 feet are 



Robinson's Lime- 



Limestone, 16 



Volcanic Series, 



out, the three 





limestone. 



stone, 21 feet. 



feet. 



1500 feet. 



beds of the Upper 







Melmerby Scar 



Thin Limestone, 



Calciferous Sand- 



Group only giv- 







Limestone, 142 



5 feet. 



stone Series, 



ing 12^ feet of 







feet. 



Woodend, Hob- 



1500 feet, with 



limestone ; the 15 







Measures, 519 



berlaw, or 4 



about 40 feet of 



beds of the Lower 







feet. 



fathom, 15 feet. 



limestone. 



Group are 34 feet 







Total, 2082 feet, 



Dun or Redesdale 



Total, 2500 feet of 



thick, so that out 







of which 180 feet 



Limestone, 6 



stratified rocks, 



of a total thick- 







are limestone. 



feet. 



of which 244 



ness of 1032 feet 









Total, 1692 feet, 



feet are lime- 



of strata only 46 









Scremerston Coal 



stone. 



feet are lime- 









Series, 998 Beet, 





stone. 









8 inches. 













Total, 2690 feet, 













of which 240 feet 













are calcareous. 







The following table attempts to show the main factors of distribution of the 

 British Carboniferous Lamellibranchs. The Lower Carboniferous Limestone 

 includes nil beds below the Hardraw Scar Limestone and its equivalents in the 

 North of England and below the Edere Coal Series in Scotland. 



