N >YSTKM 175 



the groups are called (1) the graptolitic mudstones and (-2 tin- 

 Pale >1 



Tin- Skdgill Beds have a thickness of 70 or 76 feet, and hav.- 

 at tin; base a thin limestone containing Atrypa flexuosa, succeeded 

 by ^lial>- with J Hmorphor/raptus confertus. Tin- middle beds contain 

 Monoyraptns greyarius and Bastrites peregrinus, with /;// inurun 

 punctatus and Pfuicops ghiber. The higher bed* yi.-ld M 

 spiniyerus and M. Clingani, with many trilobites, and in tin- 

 Spengill Mvtion there is a still higher baud containing 7.'" 

 maximus in abundance. 



The Browgill Beds are thicker (about 140 feet) but less fossili- 

 ferous. They are divisible into three parts : (1) a zone of Mono- 

 graptus turriculatus ; (2) a zone of Monograptus crisput ; (3) barren 

 shales and grits. 



Salopian. This series attains a very great development in 

 "\\Yst inoreland and consists almost entirely of flagstones, sandstones, 

 and grits, with only subordinate bands of shale. The equivalent.- ot 

 the Wenlock Beds are really of less thickness than they are in 

 Shropshire, but those above the horizon of the Weulock limestone 

 (zone of Cyrt. Lundgreni) are very much thicker. The following 

 is a tabular view of the lithological divisions and the graptol it it- 

 zones : 



I'ivisions. / ;.-. 



Bannisdale slates (4000 feet). Sandy mudstones) 



with beds of hard sandstone. Orthoccras J-M. Leintwardineusis. 



primcevus and 0. subundulatuin. 

 Coniston grits (4000 feet). Red grits and flags J *. . 



with Cardiolainterrupla,Ptcrineatenuistriatu, '..' 



Dayia navicula, and Orthis lunata. j ' 8t ' us * 



Coldwell flags (2000 feet). Grey flags and grits | , . , 



with Acidaspis Hugftcsi, Actinocrinus quicker, j- ', VU }^ a j r i 1S x 



Monograptus colonus, and M. Jiccmcri. ) 



Coldwell grits (800 feet). Coarse grey grits. C. Lundgreni. 



Bratkay flags (1000 feet). Fine-grained bluish "1C. rigidus. 



laminated flagstones, comparable with the \M. Riccartonen-i-. 



Weulock shales and divisible into 3 zones. } C. Murchisoni. 



Downtonian. This group seems to be represented by 

 beds which succeed the Bannisdale slates and consist in the lower 

 part of bluish thin-bedded sandstones with subordinate beds of 

 shale, containing Protaster Miltoni, Dayia naincula, Cucullfila 

 Cawdori, Phucops DowningicK, and other fossils. There is also a 

 calcareous band which contains Palceaster, Prottu* lattfront, and 

 Dayia navicula, and has been identified by Mr. Avi-liiu- with the 

 Aynn-stry limestone. These beds are about 1200 feet thick. 



The highest beds, or The Kirkby Moor flags, are massive gret.Mii.-h 

 and grey sandstones, with calcareous (fossiliferou*) bands, passing 



