The New London wells are not very large, but their production is steady and uniform. The thickness of the sand rock is 40-55 ft., at a depth of about 650 ft.
Colorado wells have, in some cases, reached 150 barrels a day, and the sand rock is found on the flat, with a thickness of about 40 ft., and at an averago depth of 525 ft. The area here is probably far from being yet determined.
Enterprise has a few scattered wells, which have produced a small quantity of oil for a long time, from a sand rock 17-38 ft. thick, at a depth of about 450 ft.
The Titusville oil districts are :-1. The Watson, Guild, and Parker Flats, which gave much of the yield between 1859 and 1864. 2. The Drake Well, whose oil was found in a crevice, the well being subsequently drilled deeper, and tapping a 10-ft. sand at 150 ft., and a 55-ft. one at 370 ft., but no 3rd sand was found at 480 ft., nor in adjoining wells at 550 ft. 3. Churoh Run, where the sand rock does not seem to occupy quite the same geological horizon as that on the flats ; the wells, while never exceeding 300 barrels, have produced largely and lastingly, the sand rock being 60-75 ft. thick, and found on the run at a depth of 480 ft. 4. In the Octave District, the wells are small but durable, and the area has not been fully defined ; the sand rock is 50-70 ft. thick, at a depth of about 875 ft. 5. Miller Farm afforded some oil in 1864 from shallow wells in the 1st sand, but the quantity was inconsiderable. 6. Pleasantville. 7. National Wells have struck the 3rd sand, about 15 ft. thick, at 745 ft. on the run ; the wells do not exceed 30 barrels, but the production has been considerable. 7. West Pithole wells have found a 14-ft. sand at 730 ft.
Shamburg, once a noted centre, is now nearly exhausted. The sand rock, on the run, is 60-75 ft. thick, at a depth of 775 ft. While the largest wells in this section did not reach 500 barrels, probably no locality has contained so many good wells. A marked peculiarity of the great stretch of oil-rock, of which Shamburg forms a part, is the existence of "black " and " green " oils, so called, side by side in the same territory, so that the surface line between the two classes of wells can be sharply defined. The following figures represent a minute section of a well in this district :
—At 38 ft., was met a soft slate rock ; 70 ft. 1st sand rock; 71 ft., water crevice ; 91-112 ft., crevices ; 130 ft., bottom of fine white sand rock 60 ft. thick ; 132 ft., bluish-grey sand rock ; 152 ft., bottom of ditto ; 153 ft., slate rock, good drilling to 245 ft. ; 245-256 ft., hard dark slate and sand to 278 ft.; 278 ft., hard pebble sand crust 18 in. thick ; 280-289 ft., hard grey sand and slate; 289 ft., 2nd sand rock, hard pebbles, 11 ft. thick ; 300 ft., bluish sand and white pebbles 5i ft. thick ; 305i ft., grey and white shells for 297i ft. ; 338-440 ft., blue sandy rock, mixed with slate ; 420-480 ft., blue and red rock alternately ; 505 ft., hard blue rock crust, 15 ft. thick ; 520 ft., 3rd sand, very hard, white and yellow pebbles, 10 ft. thick ; 530 ft., mud vein ; 545 ft., through 3rd sand 25 ft. thick, two orevices, and gas very strong ; 545-575 ft., blue sand and slate to 605 ft.; 608 ft., hard crust 2 ft. thick ; 610-636 ft., blue slate ; 636 ft., hard white sand mixed with pebbles, a hard crust 4-5 ft. thick ; 640 ft., top of 4th sand ; 648-654 ft., hard pebble ; 654 ft., large gas vein and show of oil ; 655 ft.. bad mud vein ; 668 ft., through 4th sand, 287i ft. thick ; 745 ft., hard crust of slate, 6 in. thick ; 745-748 ft., hard slate ; 748 ft., hard shell, yellow pebble, and good gas vein ; 750 ft., slate rock; 768 ft., slate and hard shells ; 776 ft., top of 5th sand ; 776-8 ft., pebble rock, open and porous ; 778 ft., crevice, gas vein, and good show of oil ; 781 ft , rock darker ; 783 ft., dark rock, gassy ; 784 ft., rock porous ; 792 ft., white and yellow pebble, crevice, oil, and gas ; 794 ft., rock white, coarse, and porous ; 806 ft., mud vein ; 828-830 ft., white and yellow pebble ; 830 ft., hard, close, white sand ; 834 ft., slate and sand mixed ; 835 ft., bottom of well.