MICHK^W ACAIIKM^' OF SCFl-lNCE. 91 



third. And across the greater part of the entire width of the Detroit 

 River, clear of the foot of Bois Blanc and Sugar Islands a fourth. 



The same condition prevails off shore in Ohio waters. Also^ a showing 

 of oil was obtained in the Trenton, in November, li)l !•, at the Amherst- 

 burg quarry in Anderdon Townshi]). Essex County. 



There is also a minor sijncliiial trough on both east and west sides of 

 the central and east side Detroit River Lower Monroe area, as was 

 proven with tlie core-drill in surveys of 1910, 1911 and 1912. 



SUPPORTING EVIDKNCE PRESENTED IN THE TREND AND C HARACTER OF THE 

 ESSEX-KENT-LAMBTON-PORT HURON FIELD. 



It is interesting to observe that a line drawn from beyond Lima, Ohio, 

 past Findlay, N. iO^ E., and projected in the same general direction, 

 traverses the central part of the Ohio oil field, passes close by on the 

 west side of the Pelee Island oil field, crosses the Kingsville-Leamington 

 gas field, the Tilbury oil field and the Romney gas field, the Chatham 

 oil field, and the old Petrolia oil field. 



Along this surface, beyond the block-faulted, Lake Erie Islands part 

 of the distance, the present rock elevations are lower toward the north. 

 Overtop of the Lower Monroe are added on in order the Sylvania Sand- 

 rock, Upper Monroe, Anderdon limestone beds probably, the Onondaga 

 limestone, the Hamilton rock, and the overlying shales. It thus becomes 

 evident that whatever of local Cincinnati anticline there may have been 

 in Ordovician-Silurian time, branching off into Canada (as Michigan and 

 Ohio geologists for the most part assume) there is small room for it 

 now, unless it lies deep down. 



It is not, therefore, a matter of surprise that gas and oil have escaped 

 by the Lake Erie faults into the strata of higher liorizon and relatively 

 lower elevation in the southwestern Ontario fields. 



In all of tliese fields, as in one connecting field, the oil and gas appear 

 to be held in the rock of newer formations overlying the deeper parts. of 

 that broad Silurian syncline which carries, exposed in surface extension 

 along its northern side, the Onondaga (Corniferous), the Hamilton and 

 the associated shales, across Cheboygan, Presque Isle and Alpena Counties 

 in Michigan ; across Bruce, Huron, Perth and Oxford counties in Ontario, 

 in southeast direction ; thence east by south into New York state about 

 Buffalo. 



Doubtless the whole of the western Ontario oil and gas area thus far 

 investigated, Pelee Island, Kingsville-Leamington, Tilbury, Romney, 

 Chatham, and Petrolia (and also the Port Huron field in Michigan) are 

 one continuous overflow field receiving its supply from a main reservoir, 

 the pressure in which is relieved by this outflow through disturbed strata. 



