The magnesian limestone 

 of ^m Jepsey and the seaPeh fop BaeillaPia in it. 



By ARTHUR M. EDWARDS, M. D. 



I spent a few days during the summer of 1900 near Blairstown, 

 New Jersey and 1 was then upon the so-called Hudson River Slate 

 and the Magnesian limestone of the Lower Silurian Age, according 

 lo the geologists, 1 coUected specimens and 1 looked for Bacillaria. 

 And what I saw I wish to detail herein. 



It was interesting to dwell for a time at least upon the Hudson 

 River Slate, for it was the first time that I had collected it in place, 

 as it is called, that is to say where it cxists and is not brought 

 from abroad. Besides, although I had already examined the Hudson 

 River Slates as Lower Silurian Age and had published the Bacil- 

 laria formerly when I had them got it as removed to Newark, or 

 nearly, it was a satisfaction to get it and collect it myself, as I say, 

 in place. 



I had published in 1892 and in 1898 in my Microscopie Notes 

 and it was in that publication that l detaiied the finding of the Ba- 

 cillaria in the Lower Silurian Age. But as that publication was 

 extremely limited as to the number published, being printed by 

 means of the mimeograph and only one hundred copies were is- 

 sued. Therefore I hope I will be cxcused if again now and hereby 

 1 publish it. Why I do so publish it will be plain hereafter. It was as 

 follows. I bave found the Bacillaria in the Newark sandstone, com- 

 monly known as the Jura-triassic age, and now 1 bave to record 

 the finding of them in the rocks of the Hudson River Epoch of 



I 



