FROM LOWER PALÆOZOIC ROCKS. 175 
(2.) Middle Division, or Trenton Black River Rocks of Hall and Logan. 
C‘ (a). Hard, cherty, felspathic slates, with hard, grey sandstones. 
C°(b). Black, bituminous shales and limestones, with beds of buff weathering 
dolomite beds, very fossiliferous ; Cenograplus gracilis, etc., etc. (Localities: Griffin Cove, 
Marsouin River, Gros Maule, etc.) 
C5 (c). Hard, grey sandstones, with knobbed surfaces (D. pristis abundant.) Locali- 
ties: Cape Chatte, Cape Magdalene, ete. Fossils: Leptena sericea, Orthis testudinaria, etc. 
These beds can hardly be much newer than the Trenton Limestone of the eastern 
districts; such brachiopoda as occur in these rocks occur also in the Trenton, as well as 
the Utica and Lorraine. The sequences given above are merely suggested, and are 
deduced from the general geographical arrangement of the beds. They are valueless, 
except as starting points from which to commence a detailed study of the strata upon it. 
(8.) Upper Division, or Hudson River and Lorraine Rocks of Hall and Logan (apparently wanting.) 
Thirdly.—Thus it appears at present that we are destitute of any clear evidence that 
true Utica and Hudson River strata occur anywhere along the south side of the St. 
Lawrence, from Gaspé to Quebec; all the strata seeming to be older in point of time 
than the Utica proper, as typified by the rocks of Ottawa and Lake St. John. As to the 
two formations of the Trenton and Utica, being mapped in New York and western Canada 
essentially on lithological grounds, it is exceedingly probable that the line between them 
differs greatly in true geological age when followed from Quebec to Ottawa and New 
York ; so that in some localities, where the Trenton Limestone series is poorly developed, 
the Utica of that locality actually descends to and includes the Norman’s Kill and 
Marsouin zone. But this is a point for future investigation. The facts, as they stand, 
relate the Marsouin and Graptolitic shales to the Trenton rather than to the Utica Slate, 
as at present understood. 
Fourthly.—The so-called Quebec rocks, of the town of Quebec, as typified by the 
fossils forwarded from the localities of the Cove Fields and St. John’s Market, are not of 
Quebec age at all. They are probably the newest rocks represented in the eollection, and 
possibly shade upwards from the Marsouin Graptolitic shales of Orleans Island and Cap 
Rouge. They appear, however, to be of greater antiquity than the Utica Slates of Lake 
St. John, answering to the basement zone of the British Bala, instead of to the middle 
zone, which seems to be the place of the Lake St. John shales. 
Fifthly.—These conclusions enable us to afford fairly satisfactory replies to the questions 
propounded in your note:—Are the two distinct Graptolitic zones of the Gaspé area 
rightly entered upon the maps of the Survey as of Levis and Utica, and are they 
separated from each other by any stratigraphical break (unconformity or profound disloca- 
tion)? We see that Levis rocks are certainly present, but none that we can actually 
demonstrate to be of true Utica age, as we understand the term at present. The higher 
series of Graptolite-bearing rocks have, however, their exact equivalent in the Norman’s 
Kall strata of the valley of the Hudson, referred by New York geologists to the Utica Slate, 
and they undoubtedly contain some well-known Utica forms. Hence these highest strata 
