416 RANGE AND EXTENT. 



were connected by a band of limestone brought up from below the red rock upon one of 

 the folds. Compare with Fig. 263. 



In the northwest part of Hinesburgh, the northeast part of Charlotte, and in Shelburne, 

 the character of the limestone has greatly improved. In Shelburne it is worked for mar- 

 ble, and really some specimens from these quarries are as fine statuary marble as can 

 be found elsewhere in the State. But the jointed structure begins very soon to destroy 

 it for marble ; yet its purity remains the same, as the lime manufactured therefrom 

 indicates. 



Concerning this rock in Chittenden County, Prof. Thompson has written the following : 

 " The most extensive bed of good limestone for quicklime [the continuation of the Shel- 

 burne marble] commences a little north from the east meeting house in Colchester and 

 extends south half a mile south of Winooski turnpike in Burlington, and at Winooski 

 River is about half a mile wide. At the quarry opened at the limekilns of Hon. U. H. 

 Penniman, near the high bridge, it is thought that this limestone will make a very good 

 dove-colored marble. In the same range there is a bed of very pure white limestone or 

 marble in the northeastern part of Shelburne, lying to the westward of the pond, and oth- 

 ers in the western part of Hinesburgh which will make very good lime. 



" This formation consists of compact silicious limestone, a dark greenish shale, a gray 

 finely stratified limestone, a silicious limestone with imbedded fragments and clay slate. 

 The rocks along the eastern border have an average easterly dip of about thirty degrees. 



" I have spent much time in searching along the line of the junction of this rock with 

 the slates east, hoping to find them exposed in contact, that I might have ocular evidence 

 of their manner of meeting or overlapping, but my search has been in vain. I found the 

 line everywhere covered and concealed by earth, but in many places the rocks were 

 exposed on the opposite sides of a deep ravine at no great distance apart. A case of this 

 kind occurs in the west part of St. George, where on the west side of a deep narrow valley 

 along which the road passes, the silicious limestone is exposed, and upon the opposite side 

 the magnesian [talcose] slate where its uplift forms a considerable precipice, and the val- 

 ley is only a few rods wide ; but the rocks are there concealed." 



We have found an excellent example of the junction of these two rocks at Hubbell's Falls, 

 in the bed of Winooski River. The limestone is tough, thick-bedded, and nearly desti- 

 tute of seams of stratification. Yet they are sufficiently distinct to show that their 

 inclination is small, a few rods west of the junction ; but they stand perpendicular at the 

 junction itself, side by side with the slate. As both the slate and limestone a few rods 

 distant from the immediate junction, have their normal small inclination, we have supposed 

 that a disturbance of a peculiar character was indicated, viz., that the whole body of 

 one of the rocks has been elevated above its normal position. At the same locality there 

 are broken dikes, within fifty feet, showing that a local disturbing cause has also been at 

 work. 



This is the only case of actual union of the two rocks we have seen, but we have seen 

 them within a few rods of each other in several places, as at Colchester depot. These 

 relations are the same everywhere. The dip of the limestone in Colchester is generally 

 A 7 ery small. 



Along the line, of the Vermont and Canada railroad between Colchester depot and 



