KOBTH-CAROLINA GEOLOGICAL SURVEY. 85 







FIG. 3. 



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1. Sand. 2. Brown earth. 3. Clay, four or five feet thick. 

 4. Sand and pebbles. 5. Shell marl. 6. Sand, with consoli- 

 dated beds which becomes a gray sandstone, with fossils and 

 lignite. 7. Blue clay. 8, Sand, blue clay, succeeded again 

 by sand. The formation below is here concealed under water. 



The most interesting points at Brown's landing are the 

 thick beds of sand and clay beneath the shell marl, the latter 

 of which is identical with that at Black Hock, where, it will 

 be recollected, this marl rests upon the upper bed of green 

 sand. At the landing we find interposed at least sixty feet 

 of material which does not occur at Black Rock at all. These 

 intervening beds I regard as Eocene. It may, however, prove 

 to be Miocene, and as a part of the lignite formation equiva- 

 lent to that which is spread over large tracts of country in 

 Nebraska and Kansas. It has consolidated beds, cemented 

 by carbonate of lime, in which lignite is very common. 

 Another fact of interest is the presence of green sand in the 

 shell marl, while it is almost entirely absent in the inferior 

 beds. The marl contains, also, Exogyra, Belemnites and cop- 

 rolites which belong to the green sand which were washed 

 from these beds. The change in passing from the Eocene to 

 the Miocene was attended with considerable violence, as the 

 latter have abundance of pebbles, rolled coprolites as hard as 

 quartz, teeth, etc. The bottom is truly a pebbly bed. 



