SCIENTIFIC SURVEY. 269 



Line, crossing the strata nearly at right angles over its whole 

 course. It passes in order through the towns of Eden, Trenton, 

 Ellsworth, Dedham, Holden, Brewer, Bangor, Glenburn, Kendus- 

 keag, Corinth, Charleston, Dover, Foxcroft, Guilford, Abbot, Mon- 

 son, Shirley, East Moxie, Porks plantation. No. 1 R. 5, No. 2 

 E. 6, Parlin Pond, Jackman, Dennis, Holden and Sandy Bay. 

 This line is nearly one hundred and eighty miles long by the map. 

 This route was selected in preference to any other, because it was 

 the longest one in the State which could be travelled over with a 

 carriage, and it passed through a fossiliferous region of great im- 

 portance ; and it will give a good general idea of the relative posi- 

 tion of the most important formations in the State. In future it is 

 desirable that a large number of sections be measured parallel to 

 this. This should be done, since the strata commonly possess a 

 north-easterly course, and an exploration of the geology of the 

 State by transverse lines parallel to one another, about fifteen 

 miles apart, will afford the quickest and cheapest mode of learning 

 its geological structure. The preceding figures will give a bird's- 

 eye view of the position of the rocks along the route of this section. 

 Both stratified and unstratified rocks appear upon it, and every 

 variety of dip and axis is presented. The lower section (Fig. 44,) 

 is a continuation of the upper, (Fig. 43,) while the numerous refer- 

 ences will explain the names of all the rocks and the localities 

 where the observations were made ; and the description, which is 

 to follow, will give every detail minutely. As previously inti- 

 mated, an enlarged copy of this section, colored, and with speci- 

 mens of all the rocks mentioned by name from the very localities, 

 will be on exhibition at the State House during the session of the 

 Legislature. As a matter of course the representation of the 

 larger dimensions will be the most satisfactory. 



Mount Desert Island. 



Mount Desert Island is chiefly composed of granitic unstratified 

 rocks. An occasional mass of an obscure siliceous slate appears, 

 but nowhere upon the line of the section : and for the sake of 

 showing the relations of a more than ordinarily interesting deposit 

 of quartz rock, which may possibly be of the same age with the 

 slates elsewhere upon the island, we commence the section at Bar 

 harbor, and then proceed south-west two miles to the top of Green 

 mountain, where the regular line of the section is intersected. We 



