184 ROCHESTER ACADEMY OF SCIENCE. [June 220 
Following is the 
CONDENSED SECTION OF THE ROCHESTER WELL. 
Altitude, 484 feet above tide. 
Horizon. THICKNESS. KIND OF ROCK. DEPTH. 
e: Niagara limestone, | 
lagara, | 156 ft. { Niagara shale, \ sample tr. 
Clinton limestone, 156 ft. 
Cie f 22 : cane upper green shale, sample 2. 
ee “Clinton (Pentam.) limestone, sample 3. 
| 35 “ Clinton lower green shale, sample 4. 22m 
Red Medina, 1075 “ Red sandstones and shales,samples 5-21. 1303‘ 
( 25 “ Blue shaly sandstone, sample 22. 
Oneida, “ 
4 Hard gray sandstone, sample 23. 
(Oswego) } 45 gray ’ I 3 
| 13 ° Dark gray shaly sandstone, sample 24. 1386 
Hudson &Utica 598 “ Dark shales, samples 25-37. 1984 
Trenton, 954 ‘* Dark limestone, samples 38-57. 2938 
NW iranes sss Gray limestone, sample 58. 
| 30 “ Drab limestone, sample 59. 
yy 3 ( x els 2 
Galevceroaure te Dark gray limestone, with shale, sample 60. 
44 “ Black magnesian limestone, sample 61. 
| 3“ Dark calcareous shale, sample 62. 2075 
Algonkian? ( 2“ White quartz sandstone, sample 63. 
or Archean? ( 1 “ Powdered ferruginous quartz,sample 64. 3078‘ 
3078 ee 
As three sets of the borings will be deposited in institutions, it 1s 
unnecessary to go into detailed description of all the rock samples. 
Down to sample 57 there is no chance for any doubt. The limits 
of the Medina, Hudson and Trenton are very sharp. 
The last samples of the Hudson—Utica‘are considerably darker 
than the earlier samples, but no separation can be made. 
Samples 56 and 57, making 60 feet, are pure drab-colored lime- 
stone. Indeed, 160 feet of the bottom of the Trenton, samples 54-57, 
are drab-colored, with “ birds-eye”’ structure, and are regarded by the 
writer as representing the Birdseye and Chazy limestones. Mr. 
