MIDDLE AND UPPEE ORDOVICIAN. 213 



If the succession were the same here as it is in Canada and New York, we ought to have 

 the Chazy formation represented in these four divisions. But no one acquainted with the pecu- 

 liar and strongly featured fauna of that formation could recognize it in this collection. Three 

 of the species are, indeed, Chazy fossils, but then they are not characteristic forms. The typical 

 and leading species which always go together in great numbers and in one compact army, as it 

 were, in every exposure of the true Chazy, are totally absent." 



The Lamellibranchiata, Gastropoda, and Cephalopoda of these beds have, so far as the 

 genera Ctenodonta, Subulites, Pleurotomaria, and Orthoceras are concerned, an aspect very 

 like that presented by the same genera in the Black River and Trenton formation. But spe- 

 cies similar to most of those above compared have a great range and are found in aU the differ- 

 ent groups of rocks up to the Devonian. Their occurrence here is not, in my opinion, sufficient 

 to counterbalance the negative fact that (excepting those in question) not a vestige of any one 

 of the species of the vast fauna of the Black River and Trenton has been detected. Tetradium 

 fibratum, Oolumnaria alveolata, Leptsena sericea, StropJwmera altemata, OrtMs testudinaria, 

 Calymene hlumenbacJii, and Asaphus platycephalus are sure to be found in every collection of 

 any considerable extent from these two formations. If they occurred here as abundantly and 

 persistently as they do in Canada and New York, it would be difficult to give any reason why 

 these four divisions should not be regarded as the equivalents of the Black River and Trenton. 

 But not one fragment of anything which could by any possibility be referred to any one of 

 these species can be seen in this collection. A piece of red limestone was found at Bay St. Paul 

 which is fuU of L. sericea, but it was a loose and worn fragment, lithologically differed from 

 any of the strata in question. Judging from this specimen I should say that the Trenton may 

 possibly occur somewhere near, but we can not refer, on any paleontological ground, the series 

 of strata constituting divisions I, K, L, M to that formation. 



Following Logan's section ^**^ we note in ascending order the divisions N, O, P, 

 and Q, occtirring apparently above the divisions I, K, L, and M. The numbers 13, 

 14, 15, and 16 are those by which he first designated the separate divisions. 



■ [N.] 



Feet. 



1. Blackish-gray nodular fossiliferoua limestone, in beds of from 1 to 3 inches thick, becoming 



bituminous toward the top. The foaails are Orthis, Strophomena, Rhynchonella allied to 

 ii. plena, a new species of Oamerella, Orthoceras piscator, 0. allumettense? , Amphion, Asaphus, 

 Holometopus angelini, Illaenus, and Leperditia 81 



2. Black bituminous limestones, in beds of from 1 to 3 inches thick, interstratified with fine 



brittle black bituminous shale in layers varying from a quarter of an inch to 3 inches. 

 The prevailing fossils are Stenopora fibrosa, Lingula allied to L. philomela, Orthis, Stropho- 

 mena, Bhynchonella allied to R. plena, a new species of Camerella, with C. varians, Ortho- 

 ceras, Agnostus, Amphion, Ampyx, Asaphus, Mndymion meehi, Holometopus angelini, 



Illsenus, Nileus scrutator, and Leperditia 174 



' 3. Black bituminous shale, with Graptolithus, Lingula, Orthoceras, and Paradoxides or Ole- 



nellus 22 



277 



[0.] 



14. Gray calcareous sandstones, generally fine grained; in beds of from 6 inches to 2 feet, inter- 

 stratified with black and greenish shales, which predominate toward the top. The 

 sandstones are sometimes of a conglomerate character and include pebbles of white 

 quartz and black limestone, varying in diameter from the eighth of an inch to 2 inches, 

 with small fragments of red and black jasper and flat pieces of black and green shale. 

 The sandstones and the shales are aggregated in masses varying from 6 up to 60 feet in 

 thickness. No fossils have been met with in this rock 700 



a Ulrich takes exception to the statement of Billings in regard to the Chazy and says that he (Billings) "was 

 not well acquainted with the lower and middle Chazy faunas. He knew the upper very well, but this is very differ- 

 ent from the two lower faunas. These middle and lower Chazy faunas contain species such as mentioned by Billings, 

 greatly like ' Black River ' forms. (See Raymond's papers.) " 



