214 The American Naturalist. 



[March, 



knew would present themselves there. At the same time I desired to 

 search for the infusorial earth. At one place we came to a kettle hole, 

 at the Lutheran Cemetery. I was sure it was a kettle hole and knew 

 there was clay, a Lacustrine Sedimentary deposit of Diatomacese, at the 

 bottom. I saw the glacial moraine made up of gravel and sand all 

 along the road. The moraine was a gravelly till with boulders 

 scattered through it.' On the top it was capped by a layer of about 

 three feet thick of whitish clay. This I knew to be diatomaceous, the 

 same as covers the country in New Jersey and on Manhattan or New 

 York Island. As we approached the station known as Brooklyn Hills 

 we cut through three high hills which I saw then and afterwards were 

 made up of moraine stuff, mostly gravel, with a white clay about three 

 feet thick on top. The clay was the same as we had just passed. It 

 makes the bottom of the glacial clay, the Lacustrine Sedimentary de- 

 posits of Diatomacete. In this moraine I afterwards got a small dis- 

 tinctly striated boulder and near the bottom of the hill, about twelve 

 feet from the bottom was a grey clay with Hematite nodules in it. 

 Cretaceous clay no doubt. 



The country became flat with no rising in it and sloping gradually 

 towards the coast where we came to the station known as Aqueduct. 

 Cretaceous clay underlies the country doubtless covered by glacial till 

 or moraine. At Aqueduct the railroad runs out on tressels to Rock- 

 away. At Rockaway Beach I landed and wandered south on the 

 promontory but found nothing but white siliceous sand, they were not 

 digging anywhere that I could find. I wandered north in the direc- 

 tion of Far Rockaway where the land became higher and was covered 

 by the whitish Iceberg period clay which evidently came from the 

 north-west. At Auvergne they had been digging a ditch to reclaim the 

 land from the sea. This was on the opposite side of Rockaway to the 

 Atlantic Ocean, on Jamaica Bay. The digging was over six feet deep. 

 They had thrown out some of the Iceberg clay and below that some 

 greyish soil without any stones in it. I saw at once that it was different 

 in character from the soil on the marshes and which I had learned be- 

 longed to the Raised Coast or Champlain Period. I took some home 

 and examined it and came to the conclusion that I had found what I 

 was in search of, the infusorial earth. It was no doubt what may be 

 termed Pliocene Tertiary and belonged to the Neocene Period. 



I cleaned some aud found the following Bacillaricese in it besides 

 some form-- ol So me few usual forms 



escaped me but will probably be found heretfter. 



