142 GEOLOGICAL INVESTIGATION. 



into which the P. S. ~N. S. had already entered. On this 

 occasion was announced the surprising discovery, in what 

 had been already identified as calciferons rock, of a large 

 and remarkable lot of orthoceratites and other fossils 

 of various species hitherto mostly, if not entirely, un- 

 known in that formation, and hardly to be expected 

 there. A large number of these fossils, still in their 

 rough, unstudied condition, were exhibited at that time. 



It is the object of the present paper to indicate very 

 concisely the main points of interest in the progress that 

 has been made in this field of research since the date of 

 the last report above mentioned. 



My own special explorations have been confined al- 

 most entirely to the belt of limestone extending north- 

 easterly and southwesterly through these wide fields of 

 shale. Having had my hands full of work from the 

 limestone, it is only at the junction of the two, that I 

 have given much attention to the shale. The fossils 

 found in the shales by Mr. Dale, both on the east and 

 west side of the Hudson River, wefe decided by Pro- 

 fessor Hall to represent the Hudson River group. The 

 only fossils reported by Professor Mather in the State 

 Report forty-one years ago, were Utica slate graptolites 

 on Marlborough Mountain. It now appears that the 

 Utica slate is represented nearer to our city. For 

 Messrs. Henry Booth and C. Lown lately found some 

 graptolites in the shale at Blue Point, opposite our city, 

 which, on being submitted to Mr. E. P. Whitfield, were 

 identified by him as species of the Utica slate forma- 

 tion. They cover the following species : 



Diplograptus pristis, Climacograptus bicornis, Di- 

 chograptus furcatus, and perhaps D. divaricatus, Mon- 

 ograptus gracilis, M. Sagittarius, and perhaps Diplo- 

 graptus marcedus. A statement of these facts will be 

 found in the American Journal of Science, for Novem- 

 ber, 1883. 



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