HAMIIyTON SCIKNTIFIC ASSOCIATION 133 



entertained was certainly removed by finding limestone 

 shingle neither scratched or faintly striated, close to others 

 which presented this peculiar appearance, containing precisely 

 the same organic remains which the hammer reveals in the 

 shingle washed by the water. 



None of the tail shields of Asaphus Platycephalus, which 

 I found at Winona during the past collecting season, were 

 extracted from the glacial clay ; yet I think they were 

 embedded there originally. You may notice frequently along 

 the beach, lumps of limestone presenting an appearance 

 differing from all others. I am not acquainted with the New 

 York Bird's-eye Group, but the specimens in question present 

 crystalline spots of Calcspar all over the surface, and are non- 

 fossiliferous. Apparently, while wondering how they come 

 to be there, I accidentally came on a piece of the identical 

 limestone embedded in the clay at the pond, a little to the 

 east of the camp, and this satisfactorily settled the matter as 

 far as the writer was concerned. The formation from whence 

 their fragments were transported belongs to the Black River 

 group, which underlies the Trenton. 



I have for many years considered it improbable that all 

 the corals found along the lake shore, formerly known to us 

 as Stenopora fibrosa, Cbaetetes, could have been derived 

 solely from the Hudson River series. Professor Foorde, a 

 late Assist. -Palaeontologist to the Canadian Survey, informed 

 me that no true Chsetetes had been as yet discovered in our 

 rocks. In June, last, I extracted from the glacial clay near 

 Winona a slab covered with the numerous characteristic white 

 markings precisely similar to the ones scattered along the 

 beach. 



When we know that for ages the lake has been encroach- 

 ing on its southern shore and removing the embedded mater- 

 ial, it does not appear difficult to account for the derivation 

 of many of the fossils collected on the lake shore. 



The Cincinnati groups of United States Geologists 

 received considerable attention from Professors Miller, James 

 and others. It is said to represent the upper part of the 



