DARTON.] 
VIRGINIA. 
169 
published, adds materially to our knowledge of the strata penetrated. 1 
The record, as compiled from Fontaine's notes and descriptions of the 
old records, is as follows : 
Character of borings from each stratum. 
White beach sand 
Yellow beach sand 
Small bowlders 
Mud or marl with shells 
Greensand with shells 
Impervious mud ; no shells 
Greensand and shells 
Concrete sand, stones, shells, sharp grit 
Greensand, with shells 
Concrete, hard shells, and sandstones 
Marl ; shells abundant 
Concrete (shell rock), hard 
Marl and shells 
Concrete sand 
Marl and shells 
Concrete sand 
Marl and shells 
Marl free from shells 
Stiff clay, very tenacious, of greenish-yellow color, which changes to a light 
gray after exposure to the atmosphere 
Very line sand 
Stiff clay of light greenish-yellow color, which changes to light gray on expo- 
sure 
Concrete sand with shark's teeth and cetacean vertebra) 
Clays more sandy 
Sands with 10 to 20 per cent of clay; they wero water-bearing, and the water 
rose above level of parade ground for several days ; it was very saline 
Stiff clay, becoming sandy below 
Stiff pure clays, becoming sandy at base 
Clays contain 80 per cent of sand 
Very sandy clays 
Few pebbles 
? 
Conglomerate of clay, sand, and small gravel 
? 
Hard crust 
Stiff clay 
Stiff clay, variegated in color 
Very dark stratum (clay ?) 
Change in color 
Sandy clay 
Number 
of feet 
bored. 
Thick- 
ness of 
stratum. 
0-30 
30 
30-40 
10 
40-43 
3 
43-63 
20 
63-155 
92 
155-162 
7 
162-167 
5 
167-185 
18 
185-228 
43 
228-229 
1 
229-239 
10 
239-240 
1 
240-248 
8 
248-249 
1 
249-254 
5 
254-256 
2 
265-280 
280-475 
195 
475-480 
5 
480-572 
92 
572 
572-599 
27 
599 
599-669 
72 
669-830 
61 
830 
830-851 
21 
851 
851-853 
2 
853 
853-855 
2 
855-858 
3 
858-874 
16 
874-885 
11 
885-890 
5 
890 
Unfortunately, as Professor Fontaine observes, this record is so mea- 
ger that it yields only hints as to horizons. He expresses the opinion 
that the Miocene and Eocene have a thickness of at least 800 feet and 
"that there is little doubt that at a depth of 851 leet the borings were 
The Artesian well at Fort Monroe, Va., The Virginias, Vol. Ill, pp. 18, 19, 1882. 
