HISTORICAL SKETCH. 13 



Persea nebrascensis Lx. 



Platantis Heerii Lx. 



Proteoides daphnogenoides Heer^=Ficus daphnogeno- 

 ides of this report. 



Proteoides, undeterminable. 



Qiicrcus, dentate leaves. 



Rootlets. 



Rootlets of Bquisetinn. 



Salix protcccfolia Lesq^=Salix Lesqiiereiixi of this 

 report. 



Sassafras (Araliopsis.) 



Seed of Conifer. 



Sequoia condita Lx. 



Sequoia Reichenbachi Heer.^ 



Sequoia rigida Heer. 



Sequoia Smithsiana Heer (sic.) 



Sequoia subulata Heer. 



A Sequoia with thick leaves. 



Sterculia sp. 



Stercidia, undetermined species. 

 This list was published in the special volume of the Clays of 

 N^w Jersey, by Cook and Smock. The Raritan area was treated 

 at length in this work, and the deposits were classified substan- 

 tially as they are at the present time. Following is Professor 

 Cook's somewhat generalized section of 1878:^ 



Stoneware clay, 30 ft. 



Sand and sandy clay, 50 ft. 



South Amboy fire clay, 20 ft. 



Sandy clay with leaf-impressions 3 ft. 



Sand and ''kaolin," 10 ft. 



"Feldspar," 5 ft. 



Micaceous sand, 20 ft. 



Laminated clay and sand 30 ft. 



Pipe clay 10 ft. 



Sandy clay with leaf impressions, 5 ft. 



Woodbridge fire clay. 20 ft. 



Sand, 15 ft. 



Raritan fire clay, IS ft. 



Sandy lignitic clay, 4 ft. 



Potters clay, 20 ft. 



^ Known members of the Raritan flora. 

 ^ Cook and Smock, Rept. on Clays, 1878, p. 34. 

 2 PAI^ 



