570 A. W. GRABAU LOWER ORDOVICIC FORMATIONS 



mostly calcareous, the Bcekmantown fauna appearing some 400 feet above 

 the top of the quartzite. 



The highest member of the Newfoundland series, which is commonly 

 included in the Beekmantown, is Division H, seen at Table Head, where 

 100 feet of limestone with Orthis electro, f, Maclurea nialutina ?, and 

 Ortlioceras piscator are shown. The next 165 feet are concealed, and 

 here falls the contact with divisions I to M, which are placed in the 

 Upper Chazyan and Black Biver. From the fact, however, that the 

 typical Beekmantown species Maclurea matutina and Daliiiaiiella electro- 

 are also found in I and K, it is suggested that these two divisions also 

 belong to the Beekmantown. Logan, however, says (1863 Beport, page 

 871) : ". . . The chief part of the species of the remaining gastropods 

 and cephalopods [of divisions K, L, and part 1 of M] are so closely allied 

 to some of the common forms of the Trenton group that it scarcely 

 appears doubtful that they are the same. The most striking resemblances 

 are to Ortlioceras bigsbyi and O. allumettense of the Birdseye and Black 

 Biver, and to Murchisonia gracilis, M. bellicincta, and M. perangulata of 

 the Trenton formation." If one places the dividing line with Ulrich and 

 Bassler, behveen divisions I and II, it probably falls in the covered in- 

 terval. The upper beds of M contain Camarotcechia plena, the zone fossil 

 of the Upper Chazy of Lake Champlain, together with Camarella vari- 

 ous, another typical Upper Chazy species. The same species are found 

 in the lower part of N, which succeeds it; but the remainder of 1ST, as 

 Avell as divisions O and P, are, in part at least, a repetition of the series, 

 including probably both the lower and the upper succession. If we in- 

 clude the series from D to the middle of Division M in the Beekmantown, 

 we have a total of 2,615 feet for this formation and at least 560 feet for 

 the succeeding Chazy. Judged by these standards, the North Scottish 

 species listed under numbers 16, 17, 18, 19, and 26, and referred to the 

 Chazy, Avould still be referable to the Beekmantown, thus increasing the 

 Beekmantown species to 34, or about 56.5 per cent, while the Black 

 Biver-Trenton forms comprise only 9 species, or 15 per cent. These, if 

 correctly identified, would then have to be considered long-lived species. 



Biri Limestone of Norway 



In the Mjosensee district of Norway the strata which have been found 

 resting on the crystalline basement complex have been divided as follows, 

 in descending order, according to Goldschmidt. 9 



9 Minister: Norg. Ged. Und. Aarbog for 1S91 and Blatt Lilleliammer. 1900. Gold- 

 schmidt : Ibid., 190S, toI. ii, p. 38. 



