296 STRATIGRAPHICAL GEOLOGY. 



stratigraphical structure of the gold field. It was drawn upon the scale 

 of five hundred feet to the inch, and reduced by photography to its pres- 

 ent dimensions. Stakes were set at the corners of every block of five 

 hundred feet, the positions being determined by theodolite and chaining. 

 Their places are indicated by dots upon the map, together with refer- 

 ences to town lines and other topographical features outside of the four 

 square miles measured. For convenience of reference, the letters A, B, 

 C, etc., designate the positions near the east Hne of the town next Lis- 

 bon ; while upon the line next Bath figures express the several stakes in 

 order, beginning at the south-east corner of the town. For example, 

 C — 13 denotes the stake two hundred feet northerly from the Bath line, 

 and six thousand five hundred feet westerly from the east line of refer- 

 ence, which nearly coincides with the town line between Lyman and 

 Lisbon. Figures express the catalogue numbers of the specimens ob- 

 tained, and are placed as exactly as possible over the localities whence 

 they came. Arrows show the dip of the strata ; while more precise in- 

 formation concerning the exact angles follows in the text. 



We have the following details respecting the position of the green strata in the 

 area just mentioned, entering Lyman from Bath : 



150-152— dip 85° N. 42° W. 156— dip 50° N. 22° W. 



153— dip 62° N. 40° W. 289, 290— dip 55° N. 32° W. 



154— dip 50° N. 42° W. 185-187— dip 70° N. 32° W. 



The following are the positions of the whiter schists connected with the foregoing, 

 extending as far north as the line J, but not embracing any that lie east of the green 

 schists, since the latter will be described as a separate range : 



293, 294 — dip N. 32° W. 296 — dip 45° N. 32° E. 



290— dip 55° N. 32° W. 288— dip 85° N. 32° W. 



289— dip 70° N. 42° W. 287— dip vertical, strike N. 68° E. 



From the range of green schists between the school-house and Bedell's, we have — 



161, 162— dip 60° N. 23° E. Near H— 19, Bedell's mine, 80° N. 22° W. 



Where the main range enters Lyman the rock is shaly, and is not always easy to 

 distinguish from the clay slates. Upon the hill east from Smith brook the rock is 

 typical of the group. The observations are quite numerous. 



At B— 21, vertical, strike N. 48° E. At H— 15, 85° N. 27° W. 



At G — 19, vertical, strike K. 58° E. North end of a conglomerate fold near 



At I— 19, vertical. F— 15. 80° N. 42° W. 



