142 RELICS OF PRIMEVAL LIFE 



company with Dr. Carpenter, Dr. Bonney,^ and other 

 skilled observers, and have very carefully studied all 

 the facts with reference to the mode of occurrence 

 of the forms in the beds, and their association with 

 layers of fragmental Eozoon, and have found that 

 these are strictly in accordance with the theory that 

 these old Laurentian limestones are truly marine 

 deposits, holding the remains of the sea animals of 

 their time. 



Eozoon is not, however, the only witness to the 

 great fact of Laurentian life, of which it is the most 

 conspicuous exponent. In many of the Laurentian 

 limestones, mixed with innumerable fragments of 

 Eozoon, there are other fragments with traces of 

 organic structure of a different character. There are 

 also casts in silicious matter which seem to indicate 

 smaller species of Foraminifera ; and large laminated 

 forms, apparently organic, yet distinct from Eozoon. 

 Some of these must be noticed in the following 

 pages. 



Other discoveries also are foreshadowed here. 

 The microscope may yet detect the true nature and 



* See an excellent account of one of these visits by Dr. 

 Bonney, Geological Magazine^ 1895. 



