168 LIFE OF THE PLEISTOCENE 



A. NEW JERSEY 



1. Fresh Water Formations 



Northern New Jersey is studded with glacial lakes left after the retreat 

 of the Wisconsin ice sheet. Many of these doubtless contain interesting de- 

 posits of postglacial life, but only one, White Pond, near Marksboro, Warren 

 County, has been critically examined. Leidy 177 and Baker 178 have listed the 

 species of fossil mollusks found in this small lake. These are indicated below. 

 Of the fourteen species listed, Amnicola and Valvata make up 95 per cent of 

 the material, clearly showing their relative abundance. Galba galbana is 

 now of more northern distribution and A mnicola galbana is extinct. 



Pisidium compressum Planorbis antrosus striahis 

 Amnicola limosa " campanulatus 



" galbana " deflectus 



Vahala tricarinata confusa " exacuous 



" tricarinata infracarinata Galba galbana 

 Physa ancillaria " humilis modicella 



Aplexa kypnorum Succinea retusa 

 Planorbis antrosus 



2. Land Formations 



The mastodon and mammoth have been found in a number of localities in 

 New Jersey, within the glaciated portion in the northwestern part of the state. 

 Nearly a hundred years ago, 179 the skeleton of a mastodon was found three 

 miles southwest of Long Branch, in the County of Monmouth. It was in a 

 marsh which presented the following section: 



1. Black earth containing Mastodon 8 feet 



2. Silicious sand with rolled pebbles 8 " (usually) 



Marl formation 10 to 30 feet 



Lockwood 180 reports three additional records from Monmouth County- 

 (1), Fifteen miles south of Long Branch, in swamp; (2), at sea off Long Branch 

 and in a peat meadow about two miles west of Freehold, resting on hardpan' 

 beneath peat. Leidy 181 also reported the mastodon from Warren County, and 

 Maxwell 182 recorded the same species from near Hackettstown, Warren County. 

 Stewart 183 has reported the mammoth from the Morris canal, near Schooley's 

 Mountain, Morris County, three feet beneath the surface. 



177 Proc. Phil. Acad., II, pp. 279-281, 1845. 



178 Nautilus, XVII, pp. 38-39, 1903. 



179 Ann. Lye. Nat. Hist., I, pp. 143-147, 1824. 



180 Proc. A. A. A. S., XXXI, pp. 365-366, 1882. 



181 Proc. Phil. Acad., 1870, p. 96. 



182 Proc. Amer. Phil. Soc, IV, pp. 118-121, 127, 1845. 



183 Amer. Journ. Sci., (i), XIV, p. 188. 



