NOTES ON THE GEOLOGY OF DERBYSHIRE. 35 



I have obtained from the Flora Committee notes for the guidance 

 of those who will help in the investigation of the Carboniferous 

 Flora, and a promise of any assistance that may be required from 

 Mr. Cash, the secretary of the Committee. Our Society might well 

 try and obtain such a record for Derbyshire. The services of 

 geologists in the county, and of engineers and others engaged in 

 mining, might be called to its aid, in noting the position and the 

 seam of coal in which the fossils occur. 



In the Geological Survey Memoir of North Derbyshire, are a 

 map and diagram showing the position and directions of a number 

 of measured joints occurring in the Chatsworth Grit of Stanage 

 Edge. The joints have roughly a tendency to arrange themselves 

 parallel to two fixed straight lines, which bear N.E. and S.W., and 

 these are about the directions of the dip and strike of the rocks. 

 The Officers of the Survey mention this in order that local 

 observers may be led to take up the subject more fully. 



The same remarks apply to a record of the directions of the dip 

 of planes of current-bedding, and they say that if anyone with 

 time to spare would carry on and complete what is already well 

 begun by Dr. Sorby, much light will be thrown on the question of 

 the method of the formation of the Carboniferous sandstones. 

 In a paper on " The structure and origin of the millstone grit of 

 South Yorkshire," Dr. Sorby concludes " that the materials of the 

 millstone grit in South Yorkshire were derived from the waste of a 

 south-westward prolongation of an ancient Scandinavia, the site of 

 which is now occupied by the Nonh Sea." 



There is a strongly marked contrast between the lie of the rocks 

 on opposite sides of the Pennine Anticlinal, and the memoir above 

 alluded to says that, " when a sufficiently extensive set of observa- 

 tions have been brought together, they will doubtless throw light 

 on the mechanics of the upheaval of the range." On the West 

 side the trend is nearly N. and S. ; while on the East it is some- 

 times nearly N. and S., sometimes E. and W., and sometimes 

 intermediate between the two directions. Professor Hall has 

 shown that the Carboniferous rocks of the North Midland counties 

 had their lie given them by two separate upheavals. Further 

 observations may or may not confirm this explanation. 



