DETAILED RECORDS. 187 
. Feet. 
Honeycomb sand rock 90- 95 
Limestone (pink, limy clay) 95-100 
Sand and small gravel — second water-bearing stratum 100-105 
Pinkish limy and clayey sandstone ■ 105-123 
Pinkish soft limy and sandy clay 123-147 
Soft red clay and limestone 147-162 
Gravel — third water-bearing stratum 162-165 
Soft limestone with streaks of soft clay (sample is red sandy clay) . 165-180 
Cemented sand, mostly lime rock, with streaks of clay 180-185 
Sand — fourth water-bearing stratum 185-19S 
Clay and sand 198-200 
Rig used, cable. Diameter of well, 8 inches; length of casing, 200 feet. Casing perfo- 
rated, 165 to 195 feet. 
ARKANSAS. 
(52. Well near Fulton, Hempstead County. 
[Well begun October 16, 1905; completed October 26, 1905. Authority, Charles E. Hudson, contractor. 
No samples. Geologic correlations by A. C. Veatch.] 
This vvell starts in the weathered surface of the Arkadelphia clay, penetrates that forma- 
tion, and strikes the water-bearing beds in the Nacatoch sand. The Arkadelphia clay 
and the Nacatoch sand are of Cretaceous age. 
The geology of southern Arkansas is described in Professional Paper No. 46, "Geology 
and underground water resources of northern Louisiana and southern Arkansas," by A. C. 
Veatch. 
Record of well in the NW. \ SE. \ sec. 7, T. IS, R. 25, 6 miles northeast of Fulton. 
Arkadelphia: • Feet. 
Soft red and dark clay 20- 40 
Hard black, blue, and gray clay 40-165 
Hard gray clay with layers of limestone . 165-220 
Nacatoch: 
Clay and rock 220-285 
Sandstone, sand, and clay 28.5-300 
Sandstone and sand 300-320 
Diameter of well, 2 inches. Water-bearing strata at 285 to 320 feet; main supply from 
320 feet. Water rises within 26 feet of surface. 
CALIFORNIA. 
92. Well near Alvarado, Alameda County. 
[Well begun September, 1904; completed October, 1904. Authority, W. H. Haley, driller. No samples.] 
This well is situated in the valley between two ridges of the Coast Range in which lies 
San Francisco Bay. The beds of sand, gravel, and clay penetrated were brought down 
from the Mount Diablo Range and deposited in recent or Pleistocene time as alluvial fans 
in the valley or as deltas beneath a former extension of San Francisco Bay. 
Record of well 2 miles north of Alvarado. 
Feet. 
Blue mud 0-20 
Blue clay. 20-22 
Yellow clay and gravel 22- 71 
Coarse sand 71- 74 
Yellow clay 74-80 
