NOTES ON DR. AMIS 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, ete. The comments make it clear that 
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, 
asat Windsor and Brookfield have been referred to the Windsor 
formation. . The Windsor is followed or accompanied by an 
extensive series . . 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 
Pictou 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 reported, 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 Astropolithen. 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 Hophyton, 
similar to that found at St. John, N. B. Worm tracks, I 
believe, have been before seen, but the specimen I show is 
