PART 5.— PALEONTOLOGY 1 



The Paleontology of the Credit River Section 

 By W. S. Dyer 



INTRODUCTION 



The source of the Credit river is on the western side of the Niagara cuest 

 near the village of Coningsby. From this point the river flows in a south 

 easterly direction and empties into Lake Ontario at the village of Port Credii 

 seven miles west of the city of Toronto. In its upper reaches, at Credit Fork 

 and Cataract, it cuts through the cuesta and exposes the Cataract and Lockpoi 

 divisions of the Silurian, and the Queenston red shales. Between Credit Fork 

 and Meadowvale, it winds slowly over the flat-lying drift which covers th 

 Queenston shales. Two miles south of Meadowvale, the grey fossiliferou 

 beds of the Richmond are first exposed, and from here to its mouth, a distanc 

 of about eight miles, the river cuts through these rocks in many places an 

 in addition, exposes the upper part of the underlying formation herein calle 

 "Dundas". 



The present study deals only with the paleontology of that part of th 

 section below the Queenston red shales and is based on field work performe 

 during the summers of 1921 and 1922. The method of treatment depart 

 somewhat from that used in the former numbers of this series. As the exposure 

 on the Credit are farther from Toronto than the others referred to in this repon 

 only those fossils which are new to science are treated in detail. This subjec 

 forms the second section of this number, the first being devoted to faunal list; 

 comments on important features, and the stratigraphic range of the species 

 The succession of strata and the correlation of the faunas is reserved for Par 

 6, but the necessary stratigraphic introduction precedes the paleontolog 

 in this number. 



Acknowledgments . — The work in the field as well as in the laboratory ha 

 been under the supervision of Dr. W. A. Parks of the University of Toronto 

 to whom the author is greatly indebted for advice and assistance on innumerabl 

 occasions. Thanks are also due Dr. A. F. Foerste of Dayton, Ohio, for valuabl 

 advice concerning the identification of certain brachiopods ; Prof. W. H. Shidele 

 of Oxford, Ohio, for supplying lists of Richmond fossils of Ohio with the exac 

 range of each; and Dr. E. O. Ulrich of Washington for advice regarding certai 

 specimens and microscopic sections. The drawings have been made by Mis 

 Emily and Mr. Theo. Logier and the photomicrographs by the author. 



Previous Work. — It is a surprising fact that a very small amount of wor 

 has been done in former years on the lower part of the Credit river, althoug' 

 the district is readily accessible and situated close to Toronto. The firs 

 reference in geological literature to the Credit river is found in the Report c 

 Progress of the Geological Survey of Canada for the year 1843. In this report 

 A. Murray, assistant geologist to Sir William Logan, classes all* the rock under 

 lying the country between the Rouge river in the township of Pickering on th 

 east and the Credit river on the west with his "bluish shales and sandstones" 

 which he defines as including all the rocks between the bituminous Utica shale 



ir This thesis forms a section of the general report on "The Stratigraphy and Paleontolog 

 of Toronto and Vicinity," issued in 1925 as Vol. XXXII, Part VII, Report of Ontari 

 Department of Mines. 



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