. The Canadian naturalist and geologist. Natural history -- Periodicals. Fossil Corah,—Lower Siluruvi RocJcs o/* Canada. TD7 " Petrified Cornua Ammonis. These are likewise frequently found, bnt Qot equal to tlic former in number : like the jjcctinitoc, they are found really f)etrified, and in imj^ressiojis; amongst them were some petrified snails.— Some of tliese Cornua Ammonis were remarkably big, and I do not remember jKjeiug their equals, for they measured above two feet in diameter. " DiSerent kinds of corals could be plainly seen in, and separated from, the stone in which they l
. The Canadian naturalist and geologist. Natural history -- Periodicals. Fossil Corah,—Lower Siluruvi RocJcs o/* Canada. TD7 " Petrified Cornua Ammonis. These are likewise frequently found, bnt Qot equal to tlic former in number : like the jjcctinitoc, they are found really f)etrified, and in imj^ressiojis; amongst them were some petrified snails.— Some of tliese Cornua Ammonis were remarkably big, and I do not remember jKjeiug their equals, for they measured above two feet in diameter. " DiSerent kinds of corals could be plainly seen in, and separated from, the stone in which they lay. Some w^ere wdiite and ramose, or Lithophytcs ; others were starry corals, or Madrepores; the latter were rather scarce. "I must give the name of Stone-halls to a kind of stones foreign to me,, which are found in gr^at plenty in some of the 7:ock-stone. They Avere glo- bular, one half of them projecting generally a1x)ve the rock, and the other remaining in it. Tliey consist of nearly parallel fibres, which arise from the bottom as from a center, and spread over the surface of the ball and havC' a grey colour. The outside of the balls is smooth, but has a number of small pores, which externally appear to be covered with a pale grey crust. Thcy- are from, an inch, to an inch and a half in ; * The Stone-halls which Kalm saw were most likely the puff-ball variety- of Chatetes Lycoperdon, while the branched corals of which he speaks were- the other kind. Kalm visited North America in 1749. He w-as sent to> America by the Royal Academy of Sciences at Stockholm, " to make suchi observations and collections of seeds and plants as would improve Swedish husbandry, gardening, manufactures, arts, and ; His book is full of,' remarks upon things in this country w'hich are not even yet much observed Choitetes Lycoperdon is the most abundant of all the Lower Silurianr corals. It ranges from the chazy limestone upwards to the Niagara group
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