MIDDLE AND UPPEE OKDOVICIAN. 211 



M 21. NEWFOUNDLAND, NORTHERN PENINSULA. 



In 1863 Logan ^**' stated the observed sections of the strata along the western 

 and northern coasts of the great northern peninsula of Newfoundland and dis- 

 tinguished divisions which he numbered from 1 to 16 or A to Q. Some of the 

 fossils listed by him are grouped in associations which indicate that there was 

 confusion, either because they became mixed in collecting or through the occiirrence 

 of fossils in conglomerate pebbles or on account of the presence of thrust faults; 

 but no other systematic discussions than those by Logan and Billings are available. 

 Divisions A to H inclusive have been discussed in Chapter III (pp. 149-153) . Divi- 

 sions I, K, L, and M are possibly equivalent to the upper Chazy, Black River, atid 

 Trenton of the epicontinental sea that spread to New York, though many typical 

 species of those faunas are absent and Billings was in doubt. Divisions N, O, and 

 P, described by IjOgan as higher in the series, are classed by Billings as being faunally 

 related to the Sillery and Ijevis and apparently belong lower in the Ordovician. 



Ulrich says (comments on manuscript) : 



Kespecting the Newfoundland section I fail to see reasons for regarding division I and 

 possibly up to and including division N as above the Beekmantown. Part of this series is almost 

 certainly of Beekmantown age, but other parts seem no less certainly of later age. The 

 Levis graptoHtes in division N are, I am convinced, of early Beekmantown age. Not to enter 

 into detail, it may suffice to say that an analysis of the faunas suggests ages ranging from early 

 Beekmantown to late Black River. As the oldest of these faunas occurs in the uppermost 

 division (N), the succession of the others is not regular; the evidence indicates misinterpreta- 

 tion of the structure, with overthrusting and overturn instead of the regular and unbroken 

 sequence described by Logan. 



Logan's section of divisions I, K, L, and M is as follows : 



I, 



Fe;t. 

 i. Light yellowish gray mottled and subcrystalline magnesian limestone, with geodes of calc 



spar. The limestone is divided into beds of frord 6 inches to 1 foot and shows occasional 



fossils, the only recognizable species being Maclurea matutina 65 



2. Light yellowish gray mottled magnesian limestone as before, interstratified with grayish- 

 black limestone in beds of from 3 inches to 1 foot. The magnesian beds contain Maclurea 

 matutina 70 



K. 



135 



Light-gray, subcrystalline limestone, with grayish-black limestone, both in beds of from 2 

 to 6 inches, and associated with a few bands of grayish-white dolomite, from 6 to 9 inches 

 thick, the whole interstratified at intervals of from 10 to 20 feet with black and grayish- 

 green shales. The light-gray limestone and whitish dolomite are fossiliferous, containing 

 the genera Orthis, Ctenodonta, Ophileta, Maclurea, Pleurotomaria, Murchisonia, and Ortho- 

 ceras. The described species are Orthis electro, Maclurea matutina, and Orthoceras piscator. 100 



1. Grayish- white dolomite and greenish-gray compact limestone, both in beds of from 2 to 6 



inches thick, interstratified with about 3 per cent of black and grayish-green shale, all 

 without observed fossils 104 



2. Light reddish-gray magnesian limestone, in beds varying from 15 inches to 2 feet in thick- 



ness. The rock breaks from the cliff in which it is exposed, in rectangular blocks of several 

 feet long and wide, and would make an excellent building stone. No fossils were observed. 16 



8. Brownish-gray hard limestone, in beds of from 6 inches to 2 feet; fossils occur at the base, 



among which are the genera Stenopora, Orthis, Murchisonia, Asaphus, and Leperditia 65 



4. Reddish-gray magnesian limestone, in beds of from 2 to 6 inches, without observed fossils. . . 6 



191 



