WATER SUPPLIES AND WELL RECORDS. Ill 



throughout more or less sandy, so much so that in some of the 

 samples it becomes almost a calcareous sandstone. Within the form- 

 ation are found two strata of calcareous and phosphatic clays, the 

 tirst of which is found at a depth of 195 feet, and has a thickness of 

 9 ft. 6 inches while the second is found at a depth of 260 feet and 

 has a thickness of 10 feet. Locally the materials of the formation 

 have become compact and close grained, probably in the form of 

 rounded boulders which are broken up in drilling. Such boulders 

 frequently form within the earth owing to the action of under- 

 ground water and may be either calcareous or flinty. This record 

 is of special interest as showing the great thickness of phosphatic 

 materials underlying the land pebble phosphate beds, these marls 

 being with little doubt the parent formation from which the land 

 pebble phosphate deposits have been formed. 



Local hard ledges sufficient to rest the outer casing are found 

 within this formation, the first, or 18 inch casing having been 

 rested at the depth of 65 feet, while the second or 14 inch casing 

 was rested at the depth of 139 feet and 11 inches. 



The formation next underlying this marl is a light colored lime- 

 stone made up of a mass of broken fragments and having a thick- 

 ness of 50 feet, extending from 360 to 410 feet. This limestone 

 is slightly if at all phosphatic, the few phosphate pebbles seen in 

 the samples having probably fallen in from the strata above. 



Next beneath this limestone is the light colored limestone of 

 the Vicksburg formation which is first encountered in this well at 

 a depth of 410 feet and continues with some variation to the bot- 

 tom of the well 838 feet. This formation here as elsewhere while 

 fairly uniform shows more or less variation in character. The 

 prevailing phase is a light colored or nearly white limestone consist- 

 ing of a mass of shells and broken shells or of soft granular 

 limestone with few fossils. Occasional strata are found, especially 

 deep within the formation, which are hard and compact, these 

 being usually of a brownish color and finely powdered by the drill. 

 Locally also flint masses occur. These flints represent silicified 

 limestone and may or may not be encountered in any particular well. 

 Locally the limestone is found to be partially crystallized, this phase 

 being due to the solution and redeposition of calcium carbonate by 

 underground water. This well terminated in a seven-foot cavity 

 from which an ample water supply was obtained. These cavities. 



