412 EOLIAN MAEBLE. 



In passing from Dorset to Sanclgate the limestone is continuous over the high mountain 

 into Sanclgate. We have not visited the top of Equinox Mountain, but suppose it to be 

 capped with schist like Mt. Eolus. Limestone is certainly found within a thousand feet 

 of the summit. We suppose the limestone passes around the west side of Equinox Moun- 

 tain, till it unites with the limestone upon the Battenkill River. Thus the schists of 

 Equinox Mountain are left an outlier an island of schist in an ocean of limestone. 



There are excellent marble quarries in Dorset and Danby, high up upon the great 

 mountain. The marble grows thinner, in proceeding north from Dorset. For some 

 distance the beds can be traced by their colors. In Danby there are a few small slides or 

 faults ; one of twenty feet, upon the northwest side, and another of six or seven feet in 

 Blake and Barney's quarry. In Griffith's quarry, which was not worked in 1857, upon 

 the southern wall, ten rods long and thirty feet high, the strata make two beautiful 

 curves or undulations. Large stalactitic masses have accumulated in these quarries by 

 the dripping of the water, impregnated with carbonate of lime, often curiously vesicular 

 upon the surface. Interesting trap dikes are in the vicinity, which have altered the 

 colors of the marble locally. Specimens in the Cabinet show the union of the trap and 

 limestone. Sketches of the dikes are given in the account of the unstratified rocks. In 

 the western quarry (Kelly's), there are surfaces which have been smoothed by friction- 

 cither from the dikes, or the upheaval of portions of the marble. These layers of marble 

 continue to thin out in a northwesterly direction. But they may be traced around the 

 north end of Danby Mountain, and they probably underlie the whole of this great pile of 

 mountains, and extend north from Danby in two different valleys ; the one along the 

 valley of Otter Creek through Wallingford and Clarendon ; the other along the eastern 

 base of the Taconic range of mountains, from Danby, through Tinmouth, and the west 

 part of Clarendon. These two lines of marble undoubtedly are parts of the same great 

 sheet, which has been broken by upheaving agencies. There has been very obviously a 

 fracture between the rocks upon Danby Mountain, and those north of a small stream in 

 Danby, flowing eastwards : and the former strata have been greatly elevated. No one 

 can resist the evidence of this fracture, which is so clearly set forth in a nut shell upon 

 Plate VIII, Fig. 2, that we forbear to dwell upon it here. 



In the bed of the brook from Danby Pond, near Danby Borough, the limestone appears 

 impure, but rather thick-bedded. It extends uninterruptedly along the valley of Otter 

 Creek, into Wallingford, and probably the marble is continuous the whole distance also. 



The limestone from West Dorset is continuous, through a notch on the west end of 

 Mount Eolus, with the limestone and marble in the central part of Danby, upon the 

 west range of the limestone formation. Thus the great pile of mountains in Dorset and 

 Danby is entirely surrounded and underlaid by limestone, and the three different ranges 

 are proved to be integral parts of the one great sheet. The limestone at Danby corners 

 is grayish black, thick-bedded and rather silicious, but containing encrinites. West of 

 Danby Pond there is marble dipping ten degrees easterly. Quartz and limestone are 

 curiously associated together in the north part of the town in connection with some 

 small undulations of the strata. The marble continues north through Tinmouth, 

 Clarendon, Rutland etc., forming the principal source of the marble of Vermont. This 

 range may possibly be connected with the other in Otter Creek valley, by a deep seated 



