GEOLOGY OF SARATOGA SPRINGS AND VICINITY 75 



DEEP KILL SHALE 



The Deep Kill shale has not been recognized anywhere on the two 

 quadrangles, but since it lies in the stratigraphical series between 

 the Schaghticoke and Normanskill shales, it is quite possible that 

 small parts of this formation, like that here observed of the Schagh- 

 ticoke shale, may have been forced up through the extremely dis- 

 turbed belt of Normanskill shales. Also in this case, the finding 

 of the characteristic graptolites would furnish the only conclusive 

 evidence of its presence, although the lithologic characters of the 

 Deep Kill shale are such that where well exposed they are readily 

 recognized. 



BALD MOUNTAIN LIMESTONE ^ 



At the western foot of Louse hill near the southwestern corner 

 of the Georgian area, a belt of dolomite and limestone appears on 

 the surface. It can thence be traced northward for about a mile, 

 when it disappears under drift but its presence below the latter is 

 still indicated through the frequent limestone boulders in the drift 

 seen in the stone fences. It then is again well exposed in the ridge 

 skirting the west bank of the Batten kill at its bend south of 

 Middle Falls, in the village of Middle Falls where it causes the 

 fall in the river, and north of Middle Falls in many hillocks pro- 

 truding through the drift on both sides of the road from Middle 

 Falls to Bald mountain. An excellent locality rich in fossils was 

 found by the writer in an abandoned quarry on the north bank of 

 the Batten kill a quarter of a mile above the village. In front of 

 Bald mountain the beds are now best exposed by the large quarry 

 operations which were carried on there formerly to supply the ma- 

 terial for two limekilns still standing west of the road skirting the 

 mountain on the west. From Bald mountain the beds are traceable 

 but half a mile as indicated on the map, but may reappear farther 

 north beyond the limits of the sheet. Southward of Louse hill, 

 this belt fails completely on the west edge of the Georgian in 

 Washington and Rensselaer counties. 



This limestone belt is in the neighborhood of Bald mountain, 

 that is at the Bald mountain quarries and northward accompanied 

 by a conglomerate which we have identified with the Rysedorph 



1 Grabau in his paper on the Physical and Fainial Kvolution of North 

 America during Ordovicic, etc. Time (Jour, of Geol. igog) cites a "Bald 

 Mt " formation in the correlation table I. p. 251, but on reference to the text 

 (V- 235) it is seen that the " Bald Eagle (Mountain)" conglomerate is meant. 



