22 CRETACEOUS PALEONTOLOGY. 



In his most recent publication on the subject Clark 1 also has 

 recognized, in the main, the subdivisions of the "clay-marl" as 

 defined by Knapp and Kiimmel. 



In the earlier discussions and mapping of the New Jersey Cre- 

 taceous by Clark, certain beds of more or less lignitic clays at 

 Cliffwood Point and elsewhere along the south shore of Raritan 

 Bay, which are distinctly below Knapp's Merchantville clay-marl, 

 were included in the Matawan formation, while farther south the 

 basal line of the Matawan was drawn to conform strictly with 

 the base of the Merchantville. More recently these Cliffwood 

 beds have been separated by Clark 2 from his Matawan formation 

 and have been considered as representing a distinct formation 

 between the Raritan and the Matawan, to be correlated with the 

 Magothy formation, originally defined by Barton 3 from north- 

 eastern Maryland. These beds were by Kummel 4 included in 

 the Raritan series, that series of strata being made strictly equiv- 

 alent to the "plastic clay" series of Cook ; and in this he was fol- 

 lowed by the writer 5 in a discussion of the faunas of the Cliff- 

 wood clays. It was noted by Kummel, however, that at least 

 locally there was an unconformity between one of the lower di- 

 visions of the beds referred by him to the Raritan, viz. the Am- 

 boy stoneware clay, and the beds above, 6 and further field obser- 

 vations by Berry and Bibbins, seem to show that a fairly definite 

 and mapable line between these stoneware clays and the super- 

 jacent beds can be distinguished. Under this interpretation the 

 name Raritan becomes restricted more nearly to its original 

 usage, and those beds lying between that formation and the base 

 of the Merchantville constitute a stratigraphic division which 

 doubtless may be correlated with the Magothy, as was suggested 

 by Clark, and which includes the Cliffwood clays, and the "lami- 

 nated sands" of Kummel. 7 In regard to this division of the 



1 Am. Jour. Sci. 4th Ser., vol. xviii, p. 440. 

 " Am. Jour. Sci., 4th Ser., vol. xviii, pp. 435-440. 

 8 Am. Jour. Sci., 3d Ser., vol. xlv, pp. 407-419. 

 4 Geol. Surv. N. J., Final Rep., vol. vi, p. 166. 



"Jour. Geol., vol. xiii, pp. 324-337; Geol. Surv. N. J., Ann. Kept. State 

 Geol. for 1904, pp. 133-144- 

 8 Loc. cit, p. 169. 

 7 Loc. cit, pp. 166-168. 



