90 NIXI'/I'KRXTII UEPOHT. 



over to the east bank of tlic channel at this pointy from evidence of 

 Sibley cores; a showing- of Oriskany sandstone at both the base and the 

 surface of the Anderdon Beds, this heavy silication embracing the 

 characteristic Anderdon fossil-bed and invading the dolomitic limestone 

 base of the overlying Onondaga. 



Eastward of Ballards Reef: Lower Monroe, Sylvania — pumping up 

 in one water well on the Stevenson Stock Farm; Anderdon limestone 

 beds probably, and Onondaga, in the same order as on the Avest side of 

 the reef, but in reverse direction. 



A section from Elliotts Point, Essex County, southwestward to the 

 Huron River, shows Lower Monroe over the whole distance from inshore 

 on the Essex side to the inner mouth of the Huron ; and northeast of 

 the j)oint, Sylvania, Upper Monroe, and a shallow Anderdon Beds-filled 

 trough in the Monroe. 



A section from the Huron River southeastward to Pelee Island would 

 show Lower INIonroe over the entire Detroit River mouth distance, until 

 the later formations would be crossed in ascending order off the west 

 side of Pelee Island, which is itself Onondaga. 



A section east and we^t from the south end of Pelee Island to the 

 town of Sylvania would traverse these in reverse order again, developing 

 Oriskany and Anderdon doubtless. Upper Monroe, Sylvania, Lower 

 Monroe, Clinton and Niagara probably, Salina and Lower Monroe on 

 West Sister Island, possibly Clinton and Niagara again, and again 

 Lower Monroe, until the Sandrock is again reached at Sylvania. 



The Trenton rock, popularly regarded as the natural cap of mineral 

 oil deposits since it is tlie containing cap in so many oil areas, is covered 

 everywhere throughout the whole triangular territory now being theoretic- 

 ally exploited, by newer strata. 



All the evidence invites to the trying out of the Michigan-Ohio-Ontario 

 part of the west end of I>ake Erie, from Ballards Reef south to a base 

 line about six townships in length, connecting the point Avhere the Michi- 

 gan-Ohio state line comes out on ■\Iaumee Bay, and (say) Danbury on 

 Sandusky Bay. 



The northern part of this territory may be thought to be unpromising 

 because of its very narrow width and also its remoteness from the 

 known broad tested field in Ohio. There is this favorable indication, 

 however, a series of minor folds across the general trend of the under- 

 lying Cincinnati arch. 



Ballards Reef in Wayne County, and the mouth of the Canard River 

 in Essex County, mark one upward fold. Tlie Limekiln Crossing (Essex) 

 and Stony Island (Wayne) together mark a second. The upper half of 

 Bois Blanc Island and westward beyond the international boundarv a 



