74 FLORIDA GEOLOGICAL SURVEY-I 4 TH ANNUAL REPORT 
carries the Oligocene and Eocene formations to a considerable depth in 
this part of the State. Thus the limestones which lie at the surface as 
far west as northern Walton County and western Holmes County under¬ 
lie Pensacola at an unknown depth. 
A well drilled at or near Pensacola will penetrate several hundred feet 
of sediments, chiefly sands and clays and shell marls, before reaching 
the limestones which lie at the surface at Marianna, Chipley and in 
Walton County. After reaching these limestones, the succession of 
formations, although unknown by actual test, may be more or less simi¬ 
lar to that of the Marianna-Chipley region, or may differ owing to 
changed conditions of deposition. 
The following record of a well at Pensacola indicates in a general 
way the character of the sediments to a depth of 1,607 feet. The total 
depth of the well is given as 1,620 feet. 
Log of Well No. 2, Drilled on East Hill, Pensacola, by the Pensacola Development 
Company* 
Depth in feet. 
Variegated clays ...... 0- 18 
Iron-stained sandstone ............ 18- 19 
Coarse orange sands becoming white with gravel at bottom (plenty of 
water standing 28 feet down from surface).. 19- 52 
Variegated clays with fine sand.... 52- 170 
Coarse white sand (water stood only 46 feet below surface).... 170- 185 
Gray clay ........ 185- 228 
Gray sand becoming finer at bottom... 228- 255 
Blue clay ..1. 255- 291 
Gray sand ..... 291- 305 
Soft grayish clay becoming harder at bottom..... 305- 339 
Sandstone ...I.. k ....... 339- 340 
Green clay .....I...... 340- 358 
Sandstone ............. 358- 359 
Green clay. 359- 372 
Sandstone . 372- 373 
Greenish clay .. 373- 453 
Fine green sand (water stood 36 feet below surface).. 453- 468 
Hard greenish clay .Ml.—.. lL. .Au.. 468- 583 
Greenish-gray sand (water about 40 feet below surface). 583- 605 
Very hard clay, blue-green in color....... 605- 725 
Gray sand (water 40 feet below surface). 725- 761 
Very hard green clay. 761- 901 
Fine greenish sand.. 901- 921 
Hard green clay ... 921- 991 
Rock ......§.r -S—-. 991- 992 
Clay becoming hard, greenish in color._. 992-1145 
Fine greenish sand .... 1145-1162 
Very hard greenish clay.. 1162-1245 
*U. S. Geol. Surv., Water Supply Paper No. 102, p. 258-9, 1903. 
