GEOLOGIC HISTORY. 69 
A driller's record, which was apparently kept with exceptional care, 
exhibits no change in character to indicate that the lower part of the 
beds are pre-Bonneville in age. It is worthy of note that Neels is 
located in the narrow neck of Lake Bonneville that connected 
Escalante Bay with the larger body of water to the north, as shown 
in Gilbert's map (PI. Ill of the Lake Bonneville monograph). It is 
probable that the broader parts of the lake were much deeper than 
this narrow strait, and that the sediments filling them were corre- 
spondingly thicker. 
Because of the importance of this well in showing the character 
and depth of the Lake Bonneville sediments, the driller's record is 
here given: 
Record of San Pedro, Los Angeles and Salt Lake Railroad tvell at Neels, Utah. 
Thick- 
ness Depth 
(feet), (feet). 
Surface soil 4 4 
Sedimentary (alkali) 5 9 
Fire clay 40 49 
Water-bearing quicksand 9 58 
Shale and soapstone 21 79 
Rock (sedimentary) 6 85 
Water-bearing quicksand 3 88 
Soapstone 11 99 
Soapstone with fossil bowlders 39 138 
Water-bearing quicksand 4 142 
Fire clay 12 154 
Blue waxy clay 34 188 
Gray shale and clay mixed 7 195 
Gray waxy clay 36 231 
Lava rock 12 243 
Blue waxy clay 12 255 
Sedimentary sandstone 6 261 
Blue waxy clay 25 286 
Water-bearing quicksand 6 292 
Blue waxy clay 28 320 
Water-bearing quicksand 7 327 
Sedimentary sandstone 10 337 
Yellow clay 16 353 
Water-bearing quicksand 5 358 
Yellow clay 27 385 
Blue waxy clay 110 495 
Yellow clay 15 510 
Sedimentary sandstone 24 53 1 
Blue waxy clay 17 55 1 
Soapstone 50 601 
Blue waxy clay 11 612 
Silt 8 ' ;•_'< » 
Water-bearing quicksand 3 623 
Yellow clay 53 676 
Sedimentary sandstone *. 12 688 
