THE HAMILTON ASSOCIATION. 27 



LOCAL PAL^ONTOLOGICAL NOTES IN 

 CONTINUATION. 



READ BEFORE THE GEOLOGICAL SECTION OF THE HAMILTON 

 ASSOCIATION. 



BY COL. C. C. GRANT. 



The Medina rocks, following the Cambro Silurians in ascending 

 order, afforded us very few organic remains recently. The freestones 

 of the grey band have been nearly worked out here. It could hardly 

 pay to quarry it close to the escarpment, owing to the thickness of 

 the debris, etc., resting on it. The freestone quarry near the reser- 

 voir, where I obtained so many Fucoids formerly, was abandoned 

 many years since. An Athyris was not uncommon on, or rather in- 

 side, a thin layer, which, if not identical, was closely allied to Athyris 

 Intermedia (Hall). As the specimens represented only internal' 

 casts, it would not be safe to be positive on the point. They displayed 

 the concentric lines of growth and general appearance, but were 

 larger than the Clinton Brachiopod. This, as also a Gasteropod 

 obtained at Grimsby Ravine from a large detached block, may be 

 added to Dr. Spencer's rather meagre list of Medina fossils. It was 

 sent to Ottawa for Professor Whiteaves' determination. He thinks 

 from a hurried examination it may come under the head " Holopea." 

 Where the mouth (orifice of the shell) is not clearly displayed, there 

 is always a little difficulty in classification. 



Dr. Spencer mentions the few shells in the series are mere casts 

 in the grey band Sandstones, ill preserved. Appended, you will find 

 some few others, in List B., unknown to Spencer, but I am under 

 the impression I may have omitted others (not more than three or 

 four probably). Even with this addition, the series display in this 

 neighborhood is a decidedly meagre hst of all organic remains, save 

 Fucoids. Dana remarks : " The rocks of this epoch, in New York 

 and further west, contain few fossils also." Dr. James Hall, however, 

 describes specimens we have not found here yet. 



