18 CRETACEOUS AND TERTIARY FISH. 



tained from one or the other of the lower formations and not 

 from the Hornerstown marl. 



Crosswicks. — Some material has been reported from "Cross- 

 wicks." If it was obtained near the village of that name it is 

 referable to either the Woodbury clay or the Merchantville clay, 

 both of which formations occur near that place, the former being 

 the better exposed. Neither of these is a marl, although the 

 .Merchantville is generally a marly clay. If, on the other hand, 

 the locality should be Crosswicks Creek, the specimens may have 

 come from any one of half a dozen horizons, as all the forma- 

 tions from the Merchantville to Vincentown are well exposed 

 along the creek between Crosswicks and New Egypt. Since, 

 however, the Navesink marl (Cook's Lower Marl) was the only 

 one actively exploited in those days, the chances are that they 

 came from it, if the locality reference is -to the creek. In the 

 suggested correlations it has been assumed that the specimens 

 came from the village and they are referred to the Woodbury 

 or Merchantville clays, but with more or less doubt. 



Birmingham. — At Birmingham there are extensive marl pits 

 formerly worked by the Pemberton Marl Company. A few 

 miles northeast of this point the Red Bank sand which separates 

 the Navesink from the Hornerstown marl, disappears and the 

 two marl beds are combined. It is the combined bed which 

 was so extensively worked at Birmingham, and the specimens 

 are referred to the Navesink-Hornerstown marl. 



Pemberton. — The village of Pemberton lies a scant two miles 

 east of Birmingham. Many of the fossils whose locality is 

 cited as Pemberton, unquestionably came from the pits of the 

 Pemberton Marl Company, as is shown by the donor, J. C. 

 Gaskill, who was superintendent of the pits, and they are, 

 therefore, referable to the Navesink-Hornerstown marl. At 

 Pemberton, itself, the Manasquan marl is exposed in the creek 

 banks and was formerly dug at numerous points above the 

 village. Hence some of the material labelled Pemberton may 

 be from the Manasquan formation. The outcrop of Vincentown 

 sand lies between Birmingham and Pemberton, so that the pos- 

 sibility of some material coming from this horizon must not be 

 overlooked. 



