SCIENTIFIC SURVEY. 263 



This layer seems to dip under the limestone. A bed of schist 

 thirty feet wide appears near the Fulling Mill quarry in the lime- 

 stone. If the schists between the West Keag river quartz and 

 South Thomaston are Taconic, they will be ranked equivalent to 

 the quartzose rocks of Owl's Head. 



Two varieties of the Taconic schists are designated in the map 

 of the Camden rocks in Fig. 36, the lower layer being very mica- 

 ceous, while the upper layer, or that furthest to the right, is 

 chiefly argillaceous. In the table of dips a multitude of observa- 

 tions are given. We can see the micaceous rock exposed all the 

 way from the end of Beauchamp point northward and westward 

 as far as the limestone extends, being adjacent to it. On Dead- 

 man's point an anticlinal is found in it. Here many layers of 

 quartz are interstratified with it. Near the junction with the 

 limestone on the shore, the layers of both rocks are very much 

 disturbed. The other argillaceous belt follows around the shore 

 from the interior of Camden harbor nearly to Deadman's point, 

 (the point shown on the map very near the extreme southern point 

 of the large promontory in Camden.) In some places it is impossi- 

 ble to determine the stratification, so homogeneous is the rock and 

 so obscure the layers. This is the peculiar rock spoken of by Em- 

 mons as a " wrinkled magnesian slate." Any one who looks at it 

 cursorily, will see at once the appropriateness of the term wrinkled. 

 A good place to see this schist in perfection, is on the hill in the 

 east part of Camden village. Being an enduring rock it retains 

 very well the diluvial markings. This belt we suppose to overlie 

 the other variety, and to be the uppermost member of the group. 



We hesitated somewhat how to represent the Belfast belt of 

 Taconic rock. Emmons expressed some doubt whether these were 

 truly Taconic, but we think there can be very little question that 

 they belong to the same age as the Camden group. Our difficulty 

 was another; whether it was best to distinguish between the 

 quartz rock and the argillaceous schists — if the expression be 

 proper. At the steamboat wharf and to the east, many layers of 

 quartz are interstratified with the more common slates and schists. 

 To the east the schistose rocks predominate ; while to the west of 

 Belfast the layers are mostly purely silicious, even to the very 

 border of the formation. Probably upon future maps we shall be 

 able to draw a clear distinction between these two varieties of rock . 

 An interesting fold appears in the rocks near the wharf in Belfast. 



