1887. | NEW YORK ACADEMY OF SCIENCES. 5 
Emmons) are almost certainly of the same age with those of 
Greenbush Heights, ¢. e., probably Lorraine ; although the Utica 
formation may also here be represented. ‘The hill itself has, un- 
doubtedly, a synclinal structure, but this fact appears not to 
have been recognized by those who earlier studied it. Over a 
considerable portion of its eastern slope there is a deposit of 
limestone (regarded by Emmons as an outlier of the Calciferous 
Sandrock resting unconformably upon his ‘‘ Taconic slate”) 
which extends to and forms the summit of the elevation. This 
limestone is clearly of Trenton age, and has yielded a large 
number of Trenton species. ‘The facts presented at this inter- 
esting locality appear to me strongly to favor the view that the 
Norman’s Kill graptolitic slates are newer than the 'l'renton lime- 
stone. From twelve to fifteen miles further south (in the 
Schodack and adjacent regions) there are other Trenton expo- 
sures, some of which I was at first led to regard as constituting 
an integral portion of the Lorraine formation, but which I now 
think are demonstrably not such, involved in the folds which 
have there profoundly affected the gritty and slaty rocks, in- 
cluding the Norman’s Kill graptolite-bearing beds already 
spoken of. The facts learned in eastern New York appear to 
me to demonstrate very effectually that the Norman’s Kill 
eraptolite beds are entirely independent of the Trenton forma- 
tion. 
In preparing this brief paper, I have been fully conscious of 
the fact that, inasmuch as Prof. Lapworth’s report herein re- 
ferred to is only a preliminary one relating to a very vexed sub- 
ject, any criticism of bis views upon doubtful points should be 
marked by the most respectful moderation, and governed by a 
thorough appreciation of the difficulties with which, in his 
studies of the American forms submitted to him for identifica- 
tion, he has had to deal. 
The strata affording the St. John’s Market fossils submitted 
to me by Dr. Selwyn, were placed by Sir Wm. Logan in the 
Quebec group; but from later examinations Dr. Selwyn was led 
to refer them to the Lorraine or Hudson River group. The list 
of species given at the outset of this paper appears to the writer 
to show, as already indicated, that Logan was right. It is ear- 
nestly to be hoped that, if this has not already been done, these 
species will also be brought to the notice of the learned English 
professor, in order that all of the evidence may be considered by 
him in reaching a final decision upon this important ques- 
tion. 
Mr. Georce F. Kunz exhibited a mass of meteoric iron from 
Chattooga Co., Georgia. 
