OF ARKANSAS. 7 
Chemical analysis of shell-marl, from T. P. Harris’ well, Greene county, 
Arkansas. 
STC os sigeeoecepoin g Gauss aoeceve es 72.8 
Water. -sereesees seeeeeees 1.8 | Alumina tinged with iron-- 6.8 
Insoluble silicates--..+++. «+ B4.9 J Lime ceseee see eeseeueees 8 
Carbonic acid -.+++++e+eee+ 2.7 | Magnesia. .+-+seereeeeees 3 
Peroxide of iron--+.++++++- 8.6 | Potashe sss eeee eect eeeeee 9 
Alumina « 65 se 6 eos eee ws 2.0 SOG Aik ow wai hneie eee a Capes Ge 3.2 
Lime... ee eee ee aoe see 29 Manganese «esses seeseees trace 
Magnesia +++-++.eeeeeeeees 1.2 
Phosphoric agile veer ee eee 45 84.8 
Potash--...- eee 8 Gide: wy WS we 3) 
Loss: -+.> C4 Ae MLR RR Ae RS 45 
100.00 
For comparison, is subjoined the chemical analysis of the corresponding 
shell-marl of Hickman county, Kentucky: 
Water eter ee. ei acetic EK Rares 1235-7 Silicas sis @ iws wane Bee 60.6 
Organic matter sol. in water- 80 | Alumina++++cee eee eee eeee 7.4 
Insoluble silicates.-.---+++-- 78.304 Lime- sect ee cere ee eeeeees 1.1 
Carbonic acid... -iseeeeeees 10.00 | Magnesia «+--+ +++ eees . 4 
Lime - eee ee cece cece eens 6.8 | Loss, alk, and a trace of 
Magnesia «-++e tee cree eeee 3.78 oxide of iron not esti- 
Alumina and peroxide ofiron 2.8 mated: ++sserereeeeee 3.8 
Chlorine «eee e sce eer eeeee 12 ; 
Loss, alkalies and phospho- 73.3 
ric acid, not determined: 1.55 : 
100.00 
From the best information obtained, the materials passed through in 
digging this well, were: 
Soil and mule Role aca esas nav aramelweset aes 3 feet. 
Dark-red under-clay+++++e+eeee eee e eee e cee en eens 14 « 
Siegal anaes ewe Re eee Me Mee NOK eewReNard atEwA Seas 99 
Gravel and white coarse sand, mixed. +--++++++seeees Oe Eke 
The water was obtained in the last member, viz: the white coarse 
gravel and sand. 
At James Lamb’s, three quarters of a mile east of Harris’, the shell- 
marl was struck in sinking his well at 54 feet; at Henry Cook’s, 48 feet; 
and at Daniel Martins’ (where Lindley now lives), water was obtained at 
18 feet in the shell-marl. 
Thus I have, even to the depth of 54 feet beneath the surface, not been 
able to obtain the least evidence of the existence of any of the members 
of the cretaceous formation, as far north in the north-eastern part of 
Arkansas, as they have been laid down by some geological map-makers; 
