SECTIONS IN THE JAIVLES RIVER VALLEY. 



163 



I. Section one mile east of King's Mill, left bank of James River. 



Feet 

 Pleistocene Yellow loam becoming sandy below 20 



Miocene. "\'orkto\\ n Yellow sand 15 



Shell layer in sandy matrix in which Pan- 



opea ]irpdominates 4 



Sandy clay laj'er. few shells 41^ 



Shell layer composed almost entirely of 



Chama congre<jata 8 



Sandy clay layer containing fewer shells.. 8 

 Layer composed mainly of Pecten jeffer- 



soniiis, very compact 4 



Loose sandy layer containing many small 



shells and Verien clintonius (exposed) . . 6 



Total... 6,91/2 



On Blow's Mill Run, one and oiie-lialf miles northwest of Lee Hall, there 

 is a shell layer 10 feet thick exposed about 15 feet above the creek. It con- 

 tains a great variety of niollusean fossils. 



. TI. Section right bank of James River at Fergusson's Wharf. 



Feet 

 Pleistocene ( ?) Concealed by vegetation 20 



Miocene. Yorktown Fragmental sliell mass quite thoroughly 



indurated, sharply separated from tlie 



layer beneatli 15 



Blue sandy clay, few fossils 17 



Bed of fossils, in material, similar to above 

 layer ; Chama congregata especially 

 abundant (exposed to water) 4% 



Total 56y2 



ITT. Section south bank of James River at Morgart's, five miles north of 



Smitlifield. 



Feet 



Pale yellow sandy loam 2 



Pleistocene Reddish-yellow sandy clay 2-4 



Miocene. Yorktown Yellowish calcareous highly fossiliferous 



marl, in some portions material loose, in 

 others firmly indurated by calcareous 

 cement. There is a well-defined horizontal 

 line but no unconformity between this layer 



and the succeeding 3-5 



Yellowish sandy marl, with numerous casts 

 and some decomposed shells ; similar to 

 those in following la>-«r; Cliama, Crepi- 

 rlula, etc. especially abundant 2-3 



