112 
FOURTEENTH REPORT. 
bottom preparatory to putting on the drills. There was no saudrock 
penetrated by the drills, — only dolomite at this point. The Detroit, 
Belle Isle and Windsor Ferry Company’s wells show a surface extension 
of Sylvania over the south quarter of Bois Blanc. Dredging in the river 
channel east of the island showed a Sylvania surface extension over the 
immediately adjacent river bottom. Two farms lie adjacent, eastward, 
the Patton farm and the Elliott farm. On the Patton farm, under 40 ft. 
of drift and one foot of shale, there is a 20 ft. depth of Sylvania, de- 
scribed by the driller and by Ed. Patton as ‘‘10 ft. of loose white sand 
and 10 ft. of sand-rock.” Below this 20 foot deposit the drill developed 
dolomite. South of this on the next farm, at 7 Elliotts Point, the drill 
was put down into the Sylvania some distance, under 44 ft. of drift, 
blue clay and a gravel bed next the rock, and 25 ft. of dolomite. 
Some 7,500 ft. north-easterly from this is the Colwell Grove well re- 
ported upon in TI. P. H. Bmmell’s s “Natural Gas and Petroleum in 
Ontario.” This record shows 252 ft. of “limestone” next above 60 ft. 
of “sandstone.” The well was put down in 1889, up to which time no 
fine distinction had as yet been made in the records between limestones 
and dolomites and the terms were used indiscriminately: whereas the 
“sandstone” was supposed then to be 9 Oriskany. 
In the same immediate neighborhood with the Colwell Grove well is 
the No. 28 well of my survey of 1910. This shows about four feet of 
Anderdon limestone under 12 ft. of drift and over nine feet of transi- 
tional limestone resting upon dolomite. Neighboring tests, wells No. 29. 
27, 30, and 1 of 1910 survey, show similar deposits of Anderdon. 
Thus the relationship of the Anderdon limestone beds toward the 
Sylvania Sand rock is established at this one locality, on comparison of 
the Colwell Grove well and the 1910 No. 28, — with 252 ft. of “limestone'’ 
(Brumell.) less four feet of Anderdon limestone, or 248 ft. of dolomitic 
limestone and dolomites between the bottom of the Anderdon and the 
top of the Sylvania. 
The deduction from this accumulated evidence is clamant of state- 
ment. It is this: If the dolomites above the Sylvania are Upper Monroe 
and the dolomites below the Sylvania are Lower Monroe — as is the 
common acceptation, then it follows that the rock underlying the Syl- 
vania in the new Livingstone Channel in Detroit river is of Lower 
Monroe age. 
Of this rock there is about 105 ft. of strata exposed in the “dry cut," 
which is 5,700 ft. in length, past Stony Island. The distance between 
the south end of the dry cut and the point at which a scraping of Syl- 
vania sand was removed from the surface of the dolomite west of the 
south quarter of Bois Blanc Island, is about 8,500 ft. On the evidence 
of dredgemen, contractors, inspectors and government engineers the 
dolomites over this distance are not the same strata as were handled 
within the dry cut. So of the dolomites drilled and dredged between 
the north end of the dry cut and a point north of Ballards Beef, more 
than 9,000 ft. distant, where the strata fall away to a depth beyond the 
7 The Dr. Green Shaft. 
8 Geol Survey of Canada, Part Q., Vol. V, 1889-90-91. 
o As in Dr Ami’s report of Pelee Island well, “The Comber well,” 1890, with 222 ft. of “limestone” 
over supposed Oriskanv 40 ft., and dolomites, etc. As hitherto noted, there is an 84 ft. depth of sand- 
stone" below 228 ft of “limestone” at the east end of the farm next south of the Elliotts Point location. 
And about nine miles to the northeast of Elliotts Point there has been found to be 90 ft. of gray lime- 
stone (drillings), 260 ft. of brown dolomites and 30 ft. of Sylvania. 
