1890.] NATURAL SCIKNCES OP^ PHILADELPHIA. 141 



In the sands interbedded between these diatoniaceous clays 

 occur the three lower of the water-producing strata noticed in connec- 

 tion with well No. 4. The upper one as before stated proved un- 

 satisfactory ; the middle gave but a scanty flow, and the lower 

 yielded an abundant supply of water. 



In a letter received by the writer from the late Prof. George H. 

 Cook he says : " I have written the well contractors and also marked 

 on a geological map the location and dip of strata and the depth 

 and location of the wells on the water-bearing stratum from which 

 Atlantic City may reasonably hope to get a supply of good water 

 and have assured them that it should be carefully looked for at 530 

 to 600 feet below sea level," and in a letter to a member of the com- 

 pany he named 577 feet as the probable depth. This came very 

 close to the fact as was afterwards realized. 



In the letter to the writer just quoted he states "that the bored 

 Avells at Barnegat, Harvey Cedars, Weymouth, May's Landing and 

 Pleasant Mills have all the same quality of water, have passed 

 through similar strata, and are on a dip of 25 feet per mile." 



Assuming as probable that the wells at Pleasant Mills and well 

 No. 4 at Atlantic City draw from the same stratum, and measuring 

 the distance between the two locations at right angles to lines drawn 

 through each parallel to the trend of the cretaceous strata we have 

 22 miles. The well at Pleasant Mills is of 34 feet depth below tide. 

 This would make the dip for at least the upper })ortion of the 

 Miocene beds 23 to 24 feet per mile, thus harmonizing wdth the 

 views of the late State Geologist. 



E — Beneath the diatomaceous clays and occupying the next 103 

 feet, or from 658 to 761 feet, occurs a series of fossiliferous beds as fol- 

 lows : 



Chocolate clay, comminuted shell, slightly diatomaceous. See foot- 

 note page 135. 19 



f 5 ft. Green marl full of shelly 

 677 to 700. Fossil ^' 8 ft. Sandy clay full of shell [- . . 23 

 [ 10 ft. Light sand full of shell j 



8 ft. Coarse gravel & sand nonfossiliferous "\ 

 6 ft. Quicksand nonfossiliferous ^ 26 



12 ft. Dark chocolate clay nonfossiliferous 3 



„^„ , -^ ., f 4 ft. Sandv marl and shell ) „. 



/26to iOi. lossili^_» ^ ' 1 VI 1 n ( • • ^^ 



(. 27 ft. Green marl with shell ) 



Tough clav mixed with gravel . . 4 



