472 CorrespoTidence, 



CORKESPONDENCE. 



Remarks on the Fauna of the Quebec Group of Rocks, and the 

 Primordial Zone of Canada, addressed to Mr. Joachim 

 Barrande. By Sir W. E. Logan, Director of the Geologi- 

 cal Survey of Canada. 



Montreal, 31st Dec, 1860. 

 My dear Mr. Barrandi!, 



I am much indebted to you for your letter of the 6th August, 

 which was accompanied by a copy of your communication to 

 Professor Bronn of Heidelberg, dated 16th July. Agreeably to 

 your request, I took an early opportunity of letting Mr. Hall have 

 a copy of your communication to Prof. Bro«in, and he received it 

 on the 11th or 12th September. 



I am of course aware, from the coiTespondence you have had 

 with my friend Mr. Billings and myself, how far you are acquainted 

 with our discoveries at Quebec. On two occasions, just previous to 

 the receipt of your last letter to Mr. Billings (received the 8th 

 November), I devoted the short time I could spare from other 

 engagements connected with the Geological Survey, to farther 

 researches at Point Levi. I have satisfied myself, notwithstanding 

 the conglomerate aspect of the bands of rock which contain our 

 new fossils, that the fossils are of the age of the strata. Without 

 entering at present on minute details of structure, I may say 

 that the chief part of the specimens, found up to this time, are 

 from two parallel out-crops, which might be taken as representing 

 two distinct layers. If they are such, they are comprehended in 

 a thickness of about 150 feet ; but the circumstances of the case, 

 connected with the physical structure, make it probable that the 

 one band is a repetition of the other through the influence of an 

 anticlinal fold or a dislocation. Both outcrops dip to the south- 

 eastward. 



From the more northern out-crop (which we shall call A^) we 

 have obtained Orthis 1, Leptcena 1, Camerella 1, Lingula 2, 

 Discina 1, Agnostus 3, Conocephalites\, Arionellus 4, Dikelocep- 

 halus 6, BatJiyurus 4. From the more southern out-crop (which 

 we shall call A') we have Dictyonema 1, Orthis 2, Leptcena 1, 

 Strophomena 1, Camerella 1, Cyrtodonta (f ) 1, Murchisonia 3, 

 Fleurotomaria 7, Helicotoma 2, Straparollus 2, Capulus 2, 



