34 NOTES ON THE GEOLOGY OF DERBYSHIRE. 



the coal measures, toadstone, and other igneous rocks I have 

 entered somewhat into detail in order to show that much useful 

 work may be done in the mapping of the drift, if members of our 

 Society will take a little trouble in examining foundations for 

 cellars and excavations in different parts of the town. The 

 position and height above the sea of erratic blocks or boulders 

 miglit also be reported, so that a boulder map could be made 

 showing the position and character of the blocks, although the 

 number perhaps may not be very great in Derbyshire. 



Another example of work done by a resident, is that by Mr. 

 H. T. Brown, on the Permian rocks of the Leicestershire 

 coalfields. From this paper, which appeared in the " Quarterly 

 Journal " of the Geological Society for February, 1889, we find that 

 he re-surveyed the Ingleby and Knowle Hill district on the 

 six-inch map, and showed that the sandstones of Knowle Hill, 

 which are supposed to be of Permian age, are really " an outcrop 

 of lower Keuper overlying Bunter conglomerate, and that the 

 beds owe their present position to the existence of a trough-fault, 

 which has let them down on the east against the coal measures 

 and Permian marls, and on the southwest against the last 

 mentioned beds and Bunter conglomerate." Professor Bonney 

 spoke of the paper as " the cream of a series of observations, such 

 as could only be carried on by one living in the district." 



A Yorkshire Fossil-Flora Committee was formed two years ago> 

 in connection with the Yorkshire Naturalists' Union, for working 

 out the horizontal and vertical distribution of the fossil plants. 

 Hitherto little attention has been paid to the distribution of fossil 

 plants, either in space or time, in Britain. A record of the species 

 occurring in the coal measures in Yorkshire, as far as they are at 

 present known, has been obtained, and over one hundred species 

 have been recorded. Of these many are now known to be British 

 for the first time. Such a work, extended over the whole of the 

 Carboniferous rocks of Great Britain, would be a very valuable 

 addition to the Plant Life of former times. One of the advantages 

 of a Society like ours is that, belter than an individual, it can co- 

 operate with similar societies in an extensive work of this nature. 



