272 BOARD OF AGRICULTURE. 



Some of these dikes resemble indurated slate, but their course is 

 north and south, or at right angles to the course of the strata in 

 the vicinity. West of Captain Thompson's house is an old quarry 

 of syenite, which is very beautiful but extremely tough ; so much 

 so as to prevent its use. A company once operated here, and our 

 impression is that $33,000 were wasted on the enterprise. 



Mica Schist Formation. 



For two or three miles in Trenton the rocks are concealed on the 

 direct route of the section, but it is not so at Oak point. The dip 

 there is small, the layers of mica schist dipping 20° S. 40° E., 

 almost the whole length of the west shore of Trenton above the 

 point. Probably the gneiss does not extend into Trenton on the 

 line of the seaboard, so that we are at once introduced into a for- 

 mation of mica schist, often talcose in its appearance, particularly 

 in certain layers. Near S. Crippen's house in Trenton is the first 

 ledge of schist seen by the road side, which dips 30° N. W., mak- 

 ing an anticlinal axis with the schists to the south, which must be 

 in place beneath the soil. Following the road running nearly due 

 west to the very corner of the town on Union River Bay, we find 

 the dip changes there, also, from the southeasterly dip at Oak 

 point, so that this cross road is constructed very nearly along 

 an anticlinal line. The ledge near Crippen's may be seen in the 

 road south of his house, but to the best advantage a few rods east 

 of the road on the west bank of Jordan river, where some of 

 the layers are calcareous. The locality was shown to us with the 

 inquiry whether the lime was not sufSciently abundant to warrant 

 the erection of a kiln. The rock is not adapted to be burnt for 

 lime, nor have we seen any bed of limestone in the whole of this 

 terrain of mica schist. 



Following the road to the north we see an occasional ledge 

 with the northwesterly dip. Near D. Iliggins', at the triple 

 branching of the road the rock is argillaceous and thin bedded. 

 Between here and the south part of Ellsworth the ledges are ob- 

 scured by drift. One mile from the village the ledges are numer- 

 ous, dipping 43° N. W. This varies very little from the last 

 observation on the section, hence we conclude that all the con- 

 cealed layers between Ellswoi-th and the triple branching of the 

 road in Trenton have about the same inclination. This is confirmed 

 by observations upon both flanks of the section : for in the south 



