Ground water in the Norwalk, Suffield, and Glastonbury areas, Connecticut . ems. However, it seems inadvisable to drill within 500 feet ofthe shore, or on a small island. TJ7].—Overlying the consolidated bedrock in Darien are foundthree types of mnntle rock—till, stratified drift, and the muds of thesalt marshes, the last of which, however, are not an available sourceof w^ater suppl3^ Till is the material formed by the plowing and scraping actionof the great ice sheet that overrode the region in glacial time. Itconsists of a thoroughly mixed mass of debris of all kinds of materialin fragments
Ground water in the Norwalk, Suffield, and Glastonbury areas, Connecticut . ems. However, it seems inadvisable to drill within 500 feet ofthe shore, or on a small island. TJ7].—Overlying the consolidated bedrock in Darien are foundthree types of mnntle rock—till, stratified drift, and the muds of thesalt marshes, the last of which, however, are not an available sourceof w^ater suppl3^ Till is the material formed by the plowing and scraping actionof the great ice sheet that overrode the region in glacial time. Itconsists of a thoroughly mixed mass of debris of all kinds of materialin fragments Avhich range in size from the finest of rock-flour par-ticles to boulders weighing tons. It comprises a matrix of sand, silt,and Iock flour in which are embedded pebbles, cobbles, and the smaller particles are minute interstices that are capableof absorbing rain Avater, of storing it, and of giving it out sloAvlyto wells aTid springs. AVells dug in till, unless unfavorably situated,Avill yield small but fairly reliable supplies of Avater. Forty-three. Figure 1. IT,vpi)thot!cal section of LongIoiiit, DiUit-n. Nock 70 GROUjSTD V/ATER IX iNTORWi^iK AND OTIIEE AREAS, GONlv, suck wells were measured at Darien in September, 1916. Data re-garding the depths found are given in the following table: Siii)iina>-[i of vjeUs dug in till in Daricii. Total Depth todepth. water. 1 Depth ofwater. 0 & 4 Twentj/-six of the v^ells vrere said to be unfailing, and eig^iit weresaid to fail. The reliability of the remaining nine wells was not as-certained. Stratified, drift.—Along Norwalk Eiver and Fivemile River andin other valley bottoms till is absent and stratified drift eonstitutesthe mantle rock. This drift is a water-laid deposit formed for themost part by the rev/orking of the materials of the till. The dif-ferent sizes have been sorted from one aBO-ther and laid in dis-tinct beds and lenses. Because of the elin-iination to a
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