76 HISTORICAL PALEONTOLOGY. 



be intercalated in point of time between the Laurentian and the 

 Cambrian groups ; or whether, rather, they should not be con- 

 sidered as the metamorphosed representatives of the Lower 

 Cambrian Rocks of other regions. 



As regards the fossils of the Huronian Rocks, little can be 

 said, some of the specimens of Eosoon Canadense which have 

 been discovered in Canada are thought to come from rocks 

 which are probably of Huronian age. In Bavaria, Dr. Gumbel 

 has described a species of Eozoon under the name of EozoVn 

 Bavaricum, from certain metamorphic limestones which he 

 refers to the Huronian formation. Lastly, the late Mr. Billings 

 described, from rocks in Newfoundland apparently referable to 

 the Huronian, certain problematical limpet-shaped fossils, to 

 which he gave the name of Aspidclla. 

 LITERATURE. 



Amongst the works and memoirs which the student may 

 consult with regard to the Laurentian and Huronian deposits 

 may be mentioned the following :* 



(1) 'Report of Progress of the Geological Survey of Canada 



from its Commencement to 1863, ' pp. 38-49, and pp. 

 50-66. 



(2) ' Manual of Geology. ' Dana. 2nd Ed. 1875. 



(3) 'The Dawn of Life.' J. W. Dawson. 1876. 



(4) " On the Occurrence of Organic Remains in the Lauren- 



tian Rocks of Canada. " Sir W. E. Logan. ' Quart. 

 Journ. Geol. Soc., ' xxii. 45-50. 



(5) " On the Structure of Certain Organic Remains in the 



Laurentian Limestones of Canada. " J. W. Dawson. 

 'Quart. Journ. Geol Soc.,' xxi. 51-59. 



(6) " Additional Note on the Structure and Affinities of 



Eozoon Canadense. " W. B. Carpenter. ' Quart. Journ. 

 Geol. Soc., ' xxi. 59-66. 



(7) " Supplemental Notes on the Structure and Affinities of 



Eozoon Canadense. " W. B. Carpenter. ' Quart. Journ. 

 Geol. Soc., xxi. 219-228. 



(8) " On the So-Called Eozoonal Rocks. " King & Rowney. 



' Quart. Journ. Geol. Soc., ' xxii. 185-218. 



(9) ' Chemical and Geological Essays. ' Sterry Hunt. 



The above list only includes some of the more important 

 memoirs which may be consulted as to the geological and chem- 

 ical features of the Laurentian and Huronian Rocks, and as 



* In this and in all subsequently following bibliographical lists, not 

 only is the selection of works and memoirs quoted necessarily extremely 

 limited ; but only such have, as a general rule, been chosen for mention as 

 are easily accessible to students who are in the position of being able to 

 refer to a good library. Exceptions, however, are occasionally made to 

 this rule, in favor of memoirs or works of special historical interest. It 

 is also unnecessary to add that it has not been thought requisite to insert 

 in these lists the well-known handbooks of geological and palaeontological 

 science, except in such instances as where they contain special information 

 on special points. 



