GEOLOGICAL SKETCH OF THE REGION OF TUCSON. 59 
400 feet, of yellow ‘‘cement clay” at the bottom. Water was found at the 
depth of 868 feet, and rose in the well to within 432 feet of the surface. 
This well yields approximately from 3,000 to 4,000 gallons of water per 
hour. 
Sectton at the Esmond Well. 












z= ATA | t= : 
| 2 Formation. pale ee | 2 Formation. ahs s | 
Q feet. | | a | feet. | 
o| Caliche and boulders...... ers hie a2ali Graveleveoesew see e eee: 6 
Seer Glow. clay... .s.<..6.% 2. As | wage ellowclaysnustes Sean 6 A 
get Caliche and sand......... 6 || 432| Water rises-to this level...| — | 
SMI W CLAY gon oh 2 o.si03)0s 4 || 440] Cement gravel........... Io | 
4s| Caliche andsand......... 1 pilh | Re foie te ee ae eae eae 30 
Pe OUOW CLAY. foc. ee ee ee 35 | 478 Cenient gravel)... .....-: 8 
ae 6 } SOOM GAA. Here he a ae ae ee 28 
Gomer ciow Clays... 66... 560. to. 9) S26) Cementoravel i-to-i. 20 
ES ae eee ee Wi SOREN LA cee carn fal ahs a i niipn arate 4 
SR EMOW CLAY. 6 w gn.-. s+ ne 0» TO gl SSR Cement STAVE). eo dain an. 5 
EPO! fae ce we sn ew +s ae SAE ROE Re ee 20 | 
fae) Vellowclay............-- 18 || 563} Cementgravel........... 8 | 
150| Gravel and boulders....... PpeReenClaye + 2 Dees lee neta. © 22 | 
Pemex cllow clay. .4..5. 603 .-% TO. Wi SooN Cementipravel ) / tied. ah RAD 
MTEL 65, ic cise snupiah's 0.» 6js.2)- 4 | ee Te Ee ak SCRE Pe eee 70 | 
mae 1 CLOW ClAY..........¢... 20) 670) Cement gravel,..2...-,.- Io | 
188| Cement gravel........... 7 Vida as ES5 A Do Ag Se Pe eR Io | 
220| Yellowclay..............| 32 || 725 Cement gravel, boulders...) 45 | 
Pae7) ‘Cement gravel... ...-2... 7 || 868) Cement gravel........... T4352") 
BELOW Clay s0...68 sas es 9 || 871, Water gravel—water here sor 
240| Cement gravel, boulders... Ao ieooal Cement Clays... Gasman so <b See 5) 
eewey CLOW. CLAY. ¢. 0 +s viens > > I5 || 950| Cement gravel........... 46 
acs) Cement gravel........... BUT OC te Cleves recta sen econ, Is 
Bees CHOW CIAY.. 2. ce ce ee 22 || O75) Cement oravel.. 2 .-..5...«. Io 
314, Cement gravel, boulders...) 34 Hrorsh Cenient clay? nM Geis 37 
maopey eliow clay........2..+%- 16 | 10 56| Cement gravel, boulders...| 44 
385! Cement gravel, boulders...| 55 '|1064, Bottom of 118 casing...... 8 
Poe CHOW CIAV bce. . eee nes BG WO CLA oe ies ce Sak cas ake ca bea le mia Et 
mea Cement gravel..........- Io ||1084| Coarse gravel............ 9 
Mme ellOW CLAY. 0.2 cee ese-- 3 II 1480 Yellow cement clay and | 
| Remar cient Clay had ee dee. ot | bottom of the well....... 396 
Lgl 


The thickness so represented may be regarded as only a fractional part 
of the whole thickness of the formation. We have at present no means 
of ascertaining what this thickness is, or the depth below the surface at 
which bed-rock may be reached. The coarse gravels at the depth of over 
1,000 feet indicate very ancient stream distribution when the region was 
at a greater elevation above the sea, or possibly wave-action of an 
encroaching sea during slow subsidence of the land. 
