14 NEW YORK STATE MUSEUM 



Stratigraphy of Portage Formation between the Genesee Valley and Lake 

 Erie, i map. By D. Dana Luther 



Stratigraphy of Becraft Mountain, Columbia County, N. Y. i map, 2 sec- 

 tions. By Amadeus W. Grabau 



A New Eurypterid Fauna from the Base of the Salina of Western New York. 

 21 litho. pi. By Clifton J, Sarle 



Preliminary Observations on the Cobleskill (Coralline) limestone of New 

 York. 2 pi. I map. By C. A. Hartnagel 



Disturbed Fossiliferous Rocks in the Vicinity of Rondout N. Y. 13 pi. By 

 Gilbert van I.ngen and P. Edwin Clark 



Torsion of the Lamellibranch Shell, i pi. By John M. Clarke 



Some Devonic forms. 2 litho. By John M. Clarke 



The labor necessary to preparing the publications above listed has 

 been an essential part of the office duties of all members of the staff. 

 We look on the outcome of the year in this regard as fruitful and 

 satisfactory but as in nowise lessening the sum of the problems still 

 before us. 



I have added to this report a detailed discussion of the Lower 

 Devonic rock section at Port Jervis prepared by Prof. H. W. Shimer 

 of the Massachusetts Institute of Technology. The paper has 

 features of special interest in the analysis of the faunas of the Port 

 Ewen beds and the Oriskany limestone of Trilobite mountain. 



Investigations in progress 



Correlation study of the Helderberg, Oriskany and Grande Grfeve 

 faunas. These investigations have progressed as opportunity has 

 afforded and the work is near completion. The richness of the Grande 

 Greve and Perce fauna in comparison with those of the New York 

 Helderberg and Oriskany will make the faunal lists extensive, and 

 the close analysis indicates variations due to different physical condi- 

 tions, which in the fauna of a single geographic province might es- 

 cape notice. The problems presented by this study are not merely 

 those of the constitution of a fauna or certain allied faunas but rather 

 the variations due to distribution or occurring in the dissemination 

 of the fauna. Necessarily involved therewith is the interpretation of 

 the paleography of the early Devonic of eastern America and inci- 

 dental thereto the local geology of points both in New York and 

 Gaspe. It is hoped to complete this work in course of the present 

 year. 



