General Description of Lake Erie, 379 



Persons at Moy (opposite to Detroit) have shewn me conical 

 stalactites from the cavern, 10 inches long by 7 inches at the 

 base. 



For considerable s{)aces, this limestone is free from foreign 

 matters of any kind. At Sandusky village, and Peninsula, and, 

 I doubt not, at many other places, it contains a profusion of 

 organic remains, consisting of terebratulae, terbinoliaB, fragments 

 of trilobites, probably asaphs, and cellular madrepores, exactly 

 the same as those found in the blocks of pale limestone in the 

 large diluvial mounds of Corlaer's Hook, near New York, and 

 accompanied by producti. They are in balls, composed wholly 

 of cells radiating from a point in their circumference. The 

 cells have sides, and are filled with white calcspar. 



Near Hat Point, on Sandusky Peninsula, I met with a very 

 fine cast of a Cardium Hibernicum. 



My friend, Dr. Lyons, staff surgeon, favoured me with 

 another from this part of Lake Erie, but the exact spot I do 

 not know. 



About a mile above Amherstburgh, on the river Detroit, and 

 about half a mile from the river bank, there is, in the woods, a 

 quarry of this limestone abounding in fossils ; but I only ob- 

 served some turbos, and the smaller valves of producti, in 

 addition to those mentioned above. I have to thank Assistant 

 Commissary-General Hare for a small but valuable collection 

 from this quarry. 



Of accidental minerals, I have only observed strontian : it is 

 sometimes associated with calcspar in trihedral pyramids, and in 

 rhombs. Major Delafield has shewn me fibrous gypsum from 

 Sandusky Bay, but I am ignorant of the circumstances under 

 which it exists. 



The chief localities for strontian in this limestone are. Moss 

 Island, the Miami River (Schoolcraft), and Celeron and Grosse 

 Islands. It may occur elsewhere, but probably not in great 

 quantities, or, as in the case of the deposits now known, it 

 would have been discovered by the American surveying party 

 of the Boundary Commission — it is the foliated variety. 



In a cliff 50 feet high, on the east side of Moss Island, and 

 at mid-height there is a vein (or rather ramifying mass) of it 



