THE GEOLOGIC SEQUENCE 681 



publication of this paper. The term Niagara, on the other hand, dates 

 from 1842, and Dana's wider extension was made in 1863. The term 

 Niagara is firmly fixed in American geological literature and has the 

 added value of belonging to the New York standard, the standard section 

 for correlation -in eastern North America. These facts, coupled with 

 strict priority of definition of the two terms, have led the writers to the 

 conclusion that Billings's term must yield to Dana's and the modernized 

 term Niagaran will be used in this work. Billings's term "Anticostian," 

 although a synonym for Niagaran, will be retained for local application 

 and value. 



In subsequent years Billings described in various places the new species 

 gathered by Eichardson, and finally in 1866 (with the exception of a 

 revision of Stricklandinia in Palaeozoic Fossils, volume II) brought all 

 the information together in his "Catalogues of the Silurian Fossils of 

 the Island of Anticosti."^ Here the two lower divisions are referred to 

 the "Lower Silurian" and the remainder to the "Middle Silurian-Anti- 

 costi group." Finally, in 1863 Logan^ gave a very good synopsis of the 

 stratigraphy of the Mingan and Anticosti sections which has become the 

 standard of reference for these strata. 



The senior author spent the month of June, 1908^ on Anticosti, and 

 studied the entire Anticosti section that may be seen on the southwestern 

 side of the island from English Head to the Jumpers. The junior 

 author devoted the months of July, August, and September of the follow- 

 ing year to the same end, circumnavigated the island, studying the strata 

 of the entire shore, and studied as well the western Mingan Islands. By 

 the kindness of the owner of Anticosti Island, M. Henri Menier, we were 

 permitted to do this work. A cod-fishing boat and two men were placed 

 at our disposal and our work was further greatly facilitated through the 

 care and advice we received from the friend and legal adviser of the 

 owner, Mr. Georges Martin-Zede, and the local governor, Mr. Alfred 

 Malouin. 



General Statement of the geologic Sequence 



The Paleozoic strata of the Mingan and Anticosti Islands lie nearly 

 horizontal, but there is a definite dip to the south that appears to be 

 somewhat undulatory, "with an average slope of about ninety feet in a 

 mile" (Logan, 1863, page 220). This is the probable average dip for 

 the Mingan Island region, but there is no way of proving that the same 



■^ Billings : Geological Survey of Canada, CatalogTies of the Silurian Fossils of the 

 Island of Anticosti, 1866, pp. 1-82. 



« Logan : Geology of Canada, 1863, pp. 119-122. 1.34-135, 164, 287 ; 220-224, 298-309. 



