352 Geology of Long Island. 



11. White clay like No. 7, 5 ft 



12. White sand like No. 8, 5 * 



Total, - - - - 70 ft. 



South of this deposit, about half a mile, is a clay-pit which is 

 worked by Capt. Sammis, of Northport. Here the stratification 

 is as follows : 



Surface loam and drift, - - - 3 or 4 ft. 



Sandy kaolin, 10 " 



Yellowish clay, 4 " 



Dark blue sandy clay, - - - - 15 " 

 Dip, 5° W. 



The lowest stratum is separated into thin laminae by equally 

 thin layers of sand, in which are numerous impressions of frag- 

 ments of vegetable matter, but only one leaf-print has been 

 found ; this is in the museum of the Long Island Historical So- 

 ciety. It is a small, broadly elliptical leaf, about f in. long. In 

 this same bed was found several years ago a shark's tooth which 

 has been identified as Carcharodon angudideiis or megcdodon. 

 It is difficult to determine the relation of this stratum to the 

 other layers in the vicinity, but it is probably of the same period 

 as the laminated sands, and seems to be identical with a bed 

 which Mather describes as occurring on Eaton's Neck. (Geol. 

 1st Dist., p. 228.) 



At the brick -yard near West Deer Park, beneath the gravel 

 and drift, is a stratum of flesh-colored clay, underlaid by dark 

 blue clay containing pyrites. I was informed by the owner, Mr. 

 Conklin, that in the centre of the hill of gravel the clay rises up 

 in a fold. Between Bethpage and West Deer Park is a deposit 

 of ferruginous conglomerate and sandstone formed by the solidi- 

 fication of the stratified gravel and sand or yellow drift. This 

 rock is very similar in composition and appearance to one which 

 occurs in fragments in the glacial drift and contains vegetable 

 impressions. At Provost's yard, near Fresh Ponds, are quite ex- 

 tensive beds of brown sandy clay, reddish clay, and chocolate- 

 brown clay, dipping from the shore. The red and chocolate 



