NOTES ON DR. AMl'.S PAPER ON DICTYONEMA SLATES. POOLE. 453 



geology. Some of these have brought out papers in reply in 

 our own " Transactions," in the Ottawa "Naturalist," the proceed- 

 ings of the Mining Society, etc. The comments make itclearthat 

 the groups of beds he then proposed as typical formations, and 

 the names he suggested, have not been generally acceptable. 



As issued, this Synopsis has some paragraphs not easy of 

 interpretation, e. g., he says : " The most fossiliferous limestones, 

 as at Windsor and Brooktield have been referred to the Windsor 

 formation. . The Windsor is followed or accompanied by an 

 extensive aeries . . to which the term Millstone Grit has been 

 applied. The Westville formation is equivalent to the so-called 

 Millstone Grit, below the productive coal measures. Uncon- 

 formably above the Westville is the New Glasgow formation, 

 which is overlaid by Smelt Brook formation. Then follows the 

 Picton formation, overlaid by the Cape John formation" Then 

 we are told " The Cape John rocks, sometimes called Permo- 

 carboniferous, are well developed in Prince Edward Island . . . 

 and probably represent the equivalent of the Windsor and West- 

 ville formations of Nova Scotia." If not a mistake of the 

 printer, a veritable round robin a complete cycle of formations 

 here exists. 



Further on he says, " It is very possible, however, that the 

 Cape John formation and associated formation may be equiva- 

 lent to ' Permian ' strata in other portions of North America 

 or Europe ;" thus he leaves the situation still obscure. 



To a student of our Cambrian rocks the presence of fossils 

 in any members or any reputed members of the series is of 

 interest. Discoveries of a few have been leported, some of 

 which have been adjudged to be only concretions. But Mr. 

 Prest has found in the quartzites of Bedford and Lockport 

 Island radiating obscure structures called Astropolithon. Dr. 

 Selwyn, late Director of the Geological Survey in 1871 dis- 

 covered in the dark slates at the Ovens in Lunenburg County, 

 markings which Mr. Billings determined to be Eophyton, 

 similar to that found at St. John, N. B. Worm tracks, I 

 believe, have been before seen, but the specimen I show is 



