SIXTH REPORT OF THE DIRECTOR I9O9 23 



beds from below are as follows : (i) Soclus shale, (2) Furnace- 

 ville ore, (3,) Wolcolt limestone, (4) Williamson shale, (5) Ironde- 

 quoit limestone. In the Clinton sectioii no entirely satisfactory 

 division of the strata has yet been made. How far the divisions 

 of the Rochester section can be correlated with or applied to the 

 Clinton section is still to be determined, but they now seem to have 

 little in common. The Wolcott limestone is certainly not repeated 

 in the section at Clinton, and the presence and extent of the other 

 divisions can be determined only by careful study of the intervening 

 area. 



At Clinton there is an important stratigraphic and faunal break 

 at the top of the green shale overlying the lower or oolitic ore bed. 

 Ihe shale is here overlain by heavy limestones showing traces oi 

 ore and 9 feet higher is the upper ore or red flux bed. 



The fauna of this section indicates the presence of species of the 

 Rochester member well down in the strata and in paleontology it 

 may be unwise to separate the Rochester member and its fauna from 

 the series with which it is so intimately bound in this typical sec- 

 tion. To expand the group value of the term Clinton by the ad- 

 dition of the member Rochester involves a subtraction from the 

 Niagaran group in like degree. This procedure may be necessary 

 however as it is evident that final resolution of the original Clinton 

 will leave no element that can serve as a Clinton member, except 

 perhaps the ore beds which have long held wide recognition in 

 the Appalachian region as the Clinton iron ores. 



Dikes near Clintonville, Onondaga co. Dr Burnett Smith of 

 tlie geological department of Syracuse University has recorded 

 in Science (Nov. 19, 1909) his recent discovery of heretofore 

 unknown igneous dikes in the sedimentary rocks of Onondaga 

 county. Dr Smith's notice follows : 



The presence of a few igneous intrusions in the almost undis- 

 turbed Paleozoic strata of central New York has long been known 

 to geologists. Their extreme rarity, however, has always invested 

 them with a peculiar interest. 



Excluding the IVlanheim dike , near Little Falls, which lies about 

 75 miles east of Syracuse and which cuts Ordovician strata, we 

 find that these igneous rocks may be grouped geographically into 

 (i) those occurring in the vicinity of Ithaca and Ludlowville and 

 (2) those occurring in the vicinity of Syracuse. In both regions 

 the intrusions are peridotite and are mostly true dikes cutting in 

 the first case such Upper Devonian formations as the Genesee 

 shale and the Portage and Ithaca shales and sandstones, and in 

 the second case cutting the Salina beds of Silurian age. 



