BUFFALO SOCIETY OF NATURAL SCIENCES 1 53 



most fully agrees with the suggestion made by Goodchild that all of 

 the rocks above the Upper Ludlow in Scotland be hereafter desig- 

 nated by the term Lanarkian from the locality in which those higher 

 Siluric beds are so well exposed. 



The Lanarkian is a series of conglomerates and sandstones with a 

 total thickness of about 2800 feet, which are either unfossiliferous or 

 contain only fish and eurypterid remains with the usual ostracods, 

 and with Dictyocaris and Ceratiocaris. Plant remains, a myriopod 

 and a scorpion are among the local associates of the above fauna. 

 The series in Scotland is a more strongly marked continental one 

 than that in England. Thus there was a gradual retreat of the sea 

 from the north towards the south, beginning in Scotland in Lower 

 Ludlow time, if not earlier, and leaving all of England except Devon- 

 shire dry by the end of the Siluric. 



The Upper Siluric of England. It is only the higher divisions 

 of the Ludlow in England which contain eurypterids: i. e., the Upper 

 Ludlow rock, the Ledbury shales, the Downton Castle sandstone, 

 and the Tilestones, according to the commonly accepted classifica- 

 tion. Elles and Slater, who have done a great deal of work in the 

 Ludlow district, have been able to determine smaller subdivisions ;and^ 

 since it is from these horizons that the eurypterids have been ob- 

 tained, I quote so much of the new classification as is needed to 

 follow the merostome occurrences (61, 198). 



III. Temeside JF. Temeside or Eurypterid shales. 



Group \E. Downton Castle or Yellow sandstone. 



TX TT T „ fD. Upper Whitcliffe or Chonetes flags. 

 II. Upper Ludlow „ T „., . ..„ _, , ° . 



f. < L. Lower whitclme or Rhynchonella 



Group 



I flags. 



I. Aymestry J B. Mocktree or Dayia shales. 



Group \A. Aymestry or Conchidium limestone. 



A few typical sections summarized from those given by Elles and 

 Slater will serve to bring out the relations between the eurypterid • 

 bearing beds, and the strata containing other groups of organisms 

 On the right bank of the Teme River near Ludlow Castle a section is 

 exposed showing the beds from the Aymestry Limestone through the 

 Downton Castle sandstone. Just a little south of Dinham Bridge 

 which crosses the Teme, less than half a mile west of Ludlow, the 

 Aymestry limestone is seen. This is characterized by Pentamerus 

 knighti, Encrinurus punclatus and other typical forms. This mas- 



