THE HAMILTON ASSOCIATION. 6^ 



GEOLOGICAL NOTES. 



Read before the Geological Section. 

 BY COL. C. C. GRANT. 



It has been customary for some years at the opening ses- 

 sion of this section to bring to the notice of the members any- 

 thing new that came under observation regarding the geology 

 and palaeontology of the district. The papers on the former 

 subject by Profs. Spencer, F.G.S., "Kennedy" and "Wilkins" 

 and others, have so completely exhausted the matter that one 

 finds some difUculty in discovering anything omitted worthy 

 of notice. However, a recent visit to Grimsby satisfied me that 

 in some instances things have been unrecorded. For instance, 

 the variation in the thickness of the Upper Green Clinton lay- 

 ers at Hamilton and Grimsby I may remark here, this is 

 also perceptible on comparing the Upper Clinton beds at the 

 Jolley Cut, near the Hancock quarry, with the ones at "The 

 Blufif," a little beyond the City Reservoir. You will find the 

 lowest wedsre-shaoed sandstone bed at the former varying 

 from 9 to 4 or ^ inches at the thin end, while at "the Cliff" 

 above the railway track the same layer is not unfrequently 

 mistaken for the thick Niagara Limestone bed, known to quar- 

 rymen as "The Niggerhead." I have on several occasions ob- 

 tained from the surface of blocks which had been detached and 

 rolled down the slope, when the frost was disappearing there, 

 specimens of "Lingulae." They are difficult to extract, since 

 the matrix bears a close resemblance to Quartzite, and unless 

 they put in an appearance on the very edge of the block, only 

 a heavy sledge or chisel, worked patiently for a considerable 

 time, will aiTord perhaps a rather indifferently preserved 

 Brachiopod, which undoubtedly may be classified with "Lin- 

 gula Oblonga" Conrad, so numerous in the Iron band, and 



