The two following well-sections, that of the Springfield Traction Company and the well at the pump Station of the Springfield City Water Company, give accurate vertical sections of the rocks underlying the city of Springfield, and vicinity. As these two deep wells are a little over four miles apart, they also show that slight variations occur in the thickness of the different beds.
Log of the Springfield Traction Company's second deep well, at southeast corner of the power house, southeast corner of Phelps avenue and Main street, Springfield, Missouri, altitude 1268 feet, A. T. June to October, 1910. 
Log of deep well No. 1 of the Springfield City Water Company, located at the Fulbright Spring pump station, about thirty feet south of the engine house, near the northeast corner section 3 township 29, range 22. Drilling commenced July 18, 1914, and completed to a depth of fourteen hundred four and one-half feet January 2, 1915.
By courtesy of Mr. H. B. McDaniel, Vice-President of the Springfield City Water Company, we are able to publish the following complete log of their deep well, a summary of which has just been given. Samples of the drillings from this well have been collected by the writer, and are preserved. in the office of the company: [79-83]
Soil, red clay and broken chert.
Coarse-grained limestone, 20% white compact chert.
Coarse, gray limestone, 25% white compact chert.
Compact gray limestone, 40% white compact chert.
Hard white, compact, knife-blade chert.
Dark gray, hard, compact, silicious limestone, trace of white chert.
Coarse-grained, bluish, hard, silicious limestone, 3% white chert.
Dark bluish gray, hard, compact limestone, 5% hard white chert.
Light bluish gray, compact limestone, 10% hard white chert.
Dark blue, silicious shale.
Coarse fragments of light blue shale.
Large fragments of light blue shale.
Small fragments of light blue shale.
Gray silicious shale and lime, some chert and considerable marcasite.
Coarse particles light gray silicious dolomite.
Very light gray particles silicious dolomite, with rounded dark, water-worn sand grains, considerable marcasite, some silicious particles.
Dark, silicious, dolomitic lime, small rounded grains of drusy quartz (sand), some rnarcasite, a few rounded dark pebbles.
Mixture of highly silicious gray dolomite, some silicious shale, some marcasite, small rounded quartz grains.
Light gray, silicious dolomite.
Dark gray, silicious dolomite, few fragments of blue shale.
Gray quartzite, some dolomite.
Mixture of highly silicious dolomite, quartzite and some white flint.
Light gray, highly silicious dolomite, larger particles of brown shale
Coarse fragments highly silicious gray dolomite.
Fine particles gray, silicious dolomite, trace of marcasite.
Fine particles white dolomite (cotton rock).
Irregular particles of bluish to light gray dolomite, trace of marcasite.
Mixture of light gray dolomite, bluish chalcedonic flint and some marcasite.
Light gray dolomite.
Fine particles grayish, silicious dolomite, some marcasite, small amount chert.
Fine particles mixture of light gray dolomite, white chalcedonic chert, some marcasite, trace of sand.
Mixture of quartzite, sand-grains, silicious dolomite, marcasite, white chert.
Mixture silicious dolomite, white and chalcedonic flint, some marcasite.
Highly silicious, compact dolomite, some grains sandstone and zinc.
Coarse crystalline dolomite, some sand.
Fine, light gray to white dolomite (cotton rock).
Fine, compact, light-gray dolomite, 10% chert or quartzite.
Light gray to white dolomite, 5% blue to brown shale.
Light gray white silicious dolomite, large particles, no chert.
Very fine sand-like translucent dolomite.
Coarser-grained, light gray to white silicious dolomite, traces chalcedonic chert.
Gray silicious dolomite, 5% white chert.
Gray to white silicious dolomite, 10% white chert.
Gray silicious dolomite, 5% milk-white chert.
Dark gray silicious dolomite, 2% white chert.
Dark gray silicious dolomite, trace of glass-like quartz and granular chert.
Mixture gray to white silicious dolomite, 5% shaly white chert.
Light gray to white silicious dolomite, trace iron pyrites.
Gray silicious dolomite, 10% white chert.
Gray silicious dolomite, translucent white chert.
Dark gray silicious dolomite, 20% white chert.
Fine, pinkish sandstone, 10% quartzite.
Very fine reddish sandstone, Roubidoux s. s.
Honey-combed or pitted brown silicious dolomite and sandstone, 10% chert.
Very fine brown sandstone, rounded to angular grains.
Very fine pellucid sandstone, rounded to angular grains.
Chalcedonic to white quartzite and chert, some s. s.
Mixture of above, smaller particles, 20% silicious dolomite.
Mixture of above, with sandstone, quartzite and silicious dolomite.
Fine sandy pellucid silicious dolomite.
Dark gray silicious dolomite, white quartzite, translucent sandstone.
Brownish- silicious dolomite, some quartzite.
Light gray chalcedonic quartzite, some sandstone.
Fine-grained, light brown pellucid sandstone.
Fine-grained sand and quartzite, trace chert.
Fine-grained sandstone and quartzite, trace chert.
Fine-grained chalcedonic quartzite, some oölite.
Fine-grained chalcedonic quartzite, 20% s. s., some dolomite.
Fine-grained grayish dolomite, some quartzite.
Fine-grained, reddish-brown silicious dolomite, 10% white chert, trace iron.
Light brown, fine-grained silicious dolomite, 10% white chert.
Light gray sandy silicious dolomite, some sandstone.
Light brown compact silicious dolomite.
Light gray compact silicious dolomite.
Light brown silicious dolomite, some chalcedonic chert.
Gray silicious dolomite, some sand and white chert.
Highly crystalline silicious dolomite, some white chert.
Same, plus 20% blue chalcedonic flint.
Same, with small amount of flint.
Light gray crystalline dolomite limestone, trace of flint.
Same, plus 15% bluish chalcedonic flint.
Same, plus 10% bluish chalcedonic flint.
Same, plus 5% bluish chalcedonic flint.
Brownish silicious dolomite, 10% white chert, 1% quartzite.
Light gray silicious dolomite, 5% chalcedonic chert.
Coarser particles of gray silicious dolomite, 30% chalcedonic flint and white chert
Light brown silicious dolomite, 15% chalcedonic flint and white chert.
Light gray silicious dolomite, 20% white chert and quartzite.
Light gray silicious dolomite, fine-grained, 10% white chert and quartzite.
Fine-grained, sandy dolomite, quartzite and foetid sandstone.
Fine-grained sandy dolomite, foetid limestone, quartzite and sand.
Fine-grained, dolomite, foetid limestone, quartzite and sand.
Fine-grained pellucid dolomite.
Fine-grained pellucid dolomite, trace chert and sand.
Same as above, with trace of quartzite.
Gray granular silicious dolomite, some chert.
Mainly chert, quartzite, 10% silicious lime, trace of sand.
Fine particles grayish dolomite, 10% chert.
White, medium coarse, translucent to transparent, angular to rounded grains of quartz sand
Plain bluish quartzite sands, some dolomite.
Granular, bluish gray, translucent, silicious dolomite.
Fine-grained to compact magnesian limestone (cotton rock).
Milk-white cotton rock, slightly silicious.
Silk-white cotton rock, slightly silicious.
Minutely crystalline white silicious limestone (cotton rock).
Finely granular or compact white silicious magnesian limestone.
Minutely granular white silicious magnesian limestone, dolomite.
Compact cotton-rock, minute translucent white silicious particles dolomite.
Same as above, but less compact.
Same as above, but very fine-grained.
Same as above, but very fine-trained and slightly oölitic
Silicious magnesian limestone (cotton-rock), white and minutely crystalline.
Same as above, but more compact.
Very compact minutely crystalline dolomitic magnesian limestone (cotton-rock).
Coarser-grained translucent dolomitic magnesian limestone (cotton-rock).
Same as above, but more silicious.
Soft, compact dolomitic magnesian limestone (cotton-rock).
Same as above, but minutely crystalline.
Same as above, chalky.
Same as above, but more granular and silicious.
Soft magnesian limestone (cotton-rock).
Soft, compact white magnesian limestone (cotton-rock).
Soft, compact white magnesian limestone, chalk-like. (Several ¼-inch openings or crevices at this level and drillings difficult to obtain.)
Light grayish, fine-grained dolomitic limestone.
Milk-white, chalk-like magnesian limestone (cotton-rock).
Light gray fine-grained silicious rnagnesian lime-stone.
Same as above, but slightly darker gray.
Light gray compact chalky magnesian limestone.
Chalk-like light gray dolomitic limestone (cotton-rock).
Chalk-like white gray dolomitic limestone.
Light brown, translucent silicious dolomitic limestone.
Gray fine-grained silicious dolomitic limestone.
Very dark brown silicious rnagnesian limestone, 20% nearly black granulated limestone.
Same, with 80% light brown granular silicious limestone.
Same as above, but finer-grained.
Same as above, but coarser-grained.
Dark brown silicious limestone, composed of a few very dark particles, scattered through the lighter brown material.
Very dark silicious magnesian limestone, with a few red particles and 10% black granules--probably chert.
Dark brown silicious magnesian limestone, crystalline, with some darker particles.
Same as above.
Same as above, except darker.
Same as above, except coarser and darker, with more dark particles.
Coarser, pitted impure magnesian limestone, with a mixture of irregularly disseminated darker or lighter particles, a structure producing the differential weathering of honeycomb structure seen wherever this rock appears on the surface.
The same as above, but with more black particles.
It is noticed that the Gunter sandstone, the Decaturville, or Proctor limestone and the Bonne Terre formations were not described in the enumeration of the geological formations of Greene county. This is because they are nowhere exposed at the surface within the limits of the county, and they have been reached, in drilling, for the first time in this well. The Gunter sandstone is a white saccharoidal sandstone, with grains that are somewhat coarse, angular to rounded in shape, loosely coherent, and translucent to transparent in color. The Decaturville, or Proctor, limestone varies in the state from 60 to 100 feet in thickness, and is the highest non-cherty formation of the Cambro-Ordovician series of rocks. It is composed, largely, of a granular, bluish-gray, translucent, silicious dolomite.1
The beds from 1114 feet to the bottom of the well, 1404½, the writer has doubtfully correlated as belonging to the Bonne Terre formation. They are largely made up of soft, white "cotton-rock," merging into a darker gray, silicious dolomitic limestone. The very small amount of chert or flint would seem to indicate the Bonne Terre, rather than the Potosi formation, which has a larger quantity of chert.
It is very difficult to accurately differentiate these lowest beds, with only the drillings as a guide, since they are so far removed from any surface exposures.