of the Lake District. 537 



Phacops oltusicaiidatus, Salt Coldwell ; Troutbeck ; Helm Knot, etc. 



■ ■ iort7(!«, Wyatt-Edgell, M.S. ... East side of Troutbeck; Helm Knot. 



Acidaspis, sp Randy Pike. 



Cheirii.rus, sp Eandy Pike. 



Cardiola interrupta, Brod. ... Troutbeck. 



Orthoceras siibanmdare, Munst Coldwell? Eandy Pike ? 



angulatum, Wabl Coldwell ? 



•• originale, Barr Coldwell ? 



recticinctum, Blake Coldwell. 



' lineatum, His Coldwell. 



var. tenuistriatum, Blake. Randy Pike. 



truncatum, Barr Coldwell. 



imbricatum, Wabl Coldwell. 



The list of Cephalopods is compiled from Prof. Blake's " British 

 Fossil Cephalopoda." Several of the above Cephalopods occur in 

 the same beds on the north side of Helm Knot, Dent. Many other 

 indeterminable fossils also occur, including several Brachiopods. 



Upper Coldwell Beds. 

 =Zone of Monograjjtus bohemicus (lower part). 



I pointed out in 1878 that the fossils found in the beds assigned 

 to the Lower Coniston Grits on the East side of Lune are the same 

 as those found in the strata included in the Upper Coniston Flags 

 on the west side of that river, and that both immediately succeed 

 the zone of Phacops obtiisicaudatus, indicating that the line of 

 demarcation between grits and flags on the east side of Lune, as 

 di'awn by the Geological Surveyors, is much lower in the succession 

 than that which they have adopted in the central portion of the Lake 

 District. The Brathay Flags only are included in the Coniston 

 Flags on the eastern side ; the top of these flags, as shown by the 

 fossils, is a more natural place to draw the line, than that adopted 

 further to the west ; and it is somewhat unfortunate that the terms 

 Coniston Flags and Coniston Grits have got into such general use, 

 considering the vagueness of the expressions. 



Since 1878 a number of other fossils have been discovered in the 

 Windermere country, and although further search would undoubtedly 

 furnish many more species, quite sufficient have been collected to 

 show the correctness of the correlation of the Upper Coldwell Beds 

 of the Windermere countiy with the gritty flags of the S.W. side of 

 Helm Knot, Casterton and Middleton Fells, Horton-in-Kibblesdale, 

 etc. These beds, in some cases certainly, attain a thickness of about 

 2000 feet, though elsewhere a smaller thickness is at present 

 measurable. 



Fossils of the Upper Coldwell Beds. 



Clionaprisca, M'Coj Helm Knot; Casterton Fell. 



flfonoffraptus colonus, Ban Brougbton Moor; Windermere, Sed- 



bergb, and llibblesdale districts, 

 t — Ecemeri, Barr Windermere, Sedbergh, and Eibbles- 



dale districts. 

 t bohemicus, Barr Windermere, Sedbergh, and Ribbles- 



dale districts. 



XSpirorhis Zewisii, Sow Casterton Fell ; Helmside. 



f Actinocrinus? pulcher, Salt Casterton Fell; Cautley ; Hortoa ; 



Troutbeck. 



