Californian Metamorphic Formations. — Hershey. 245 
boniferous or Jurassic slates, and this is probably true of them 
in large part. Some of them are referred to as possible repre- 
sentatives of pre-Cambrian formations. As the Klamath re- 
gion is merely a sort of outlier of the Sierra Nevada, so far as 
its stratigraphical and earlier dynamical geology is concerned, 
it is probable that in time a part of the Sierra Nevada schists 
will be definitely separated from the Carboniferous and Jurassic 
series and correlated with the Klamath schists. 
On the whole, it seems impracticable to fix upon any partic- 
ular part of the time between the Archaean and the the Devon- 
ian as the period of deposition of the Klamath schists, but I 
believe the evidence favors the earlier or Algonkian portion 
rather than the Cambrian or Silurian, although I should not 
like to be placed on record as correlating these schists with the 
Algonkian in any other than an extremely problematical way. 
Berkeley, Cal., Jan. 3, 1901. 
ON THE HELDERBERGIAN FOSSILS NEAR 
MONTREAL, CANADA.* 
By Charles Schi-chert, Washington. 
St. Helen's Island in the St. Lawrence river, opposite Mon- 
treal, and now one of the public parks and fortifications of that 
city, furnishes an interesting bit of geology. At the upper ex- 
tremity of the island, close to the ferry landing, is seen the 
Utica shale cut by dikes of a highly altered basic rock and an 
intrusive sheet of dioryte lamphrophyr (=camptonyte), and 
overlain by agglomerate which covers almost the entire island. 
Around the island to the southeast are occasionally found 
small blocks of limestone containing Trentonian fossils, such 
as Plectambonites sericeus, Strophomcna incurvata, and monti- 
culiporoid Brj^ozoa. Towards the southeastern end of the 
island, along the water front, occurs the Helderbergian expos- 
ure. Logant describes the latter as follows : "There occur 
two masses of dark gray fossiliferous limestone, weathering 
to a light gray ; which are not magnesian. These are included 
in a length of about forty yards, and are limited on the east 
side by the water of the river ; they have a breadth of scarcely 
• Published bv permission of the Secretary of the Smithsonian Institation. 
t Geology of Canada, 1863, pp. S.'Se-SoS." 
