CONGLOMERATES 473 



somely pressed out of shape. An exposure at J. Hastings, in Bath, may 

 belong to this series, situated near the middle Upper Silurian rocks and 

 dipping to the northwest. 



Figure 6, plate 42, represents a section from the Northey road on 

 Salmon brook across the Ammonoosuc and up Mill brook on which 

 three important conglomerates are indicated, the first the probable 

 equivalent of the "calico rock," the second at the school-house by the 

 bridge, and the third another mass near <i trout-hatching establishment, 

 where a new road passes down the west side of the river. Just north of 

 the village of Lisbon and at the bridge over the river in the village, as 

 well as farther north, are other outcrops of these conglomerates. 



The last important conglomerate is represented on our section, figure 7, 

 plate 42, 1,100 feet east of the North Lisbon bridge, and has been iden- 

 tified across the valley of the south branch. It contains, besides the 

 materials mentioned beneath the bridge, pieces of soft mica schist. From 

 fancied resemblances it received the field name of " calico conglomerate." 



At first it appeared reasonable to correlate the auriferous conglomerate 

 with related material upon Salmon Hole brook, the Landaff gold mine, 

 and farther south. Further reflection suggests that this line of outcrops 

 on the east side of the Ammonoosuc should be considered as the con- 

 tinuation of the calico conglomerate of the south branch. The Landaff 

 rock is more like the auriferous than the other conglomerate, but we can 

 not insist upon close correlations of coarse sediments from superficial 

 resemblances. An apparent stratigraphic line must have a stronger 

 determinative influence than a uniform texture. 



The end of this line of conglomerate is only 2 or 3 miles distant from 

 a range of quartzite which is often composed of coarse constituents, and 

 the two are made to look toward each other by the occurrence of a re- 

 lated rock in the valley of Mill brook, Landaff, to be specially mentioned 

 later. The eastern range is the Coos quartzite of the published report, 

 now traceable from Sugar hill (figure 5, plate 42) southerly through the 

 state. To correlate these two silicious formations it is not necessary to 

 find a surface connection, since a continuation could be effected by means 

 of a fold — probably a synclinal — beneath the- eastern area of argillite 

 terminating at Pond hill in Landaff. 



It was stated that the " egg conglomerate " occupies a place near the 

 base of the Blueberry Mountain synclinal of argillite. The " calico " 

 rock is near the border of the eastern argillite range, soon to be mentioned. 

 While it is difficult to adjust the dips, the geographic positions suggest 

 a correlation which will include the majority of all the conglomerates ; 

 they may belong to the same horizon near the base of the argillite. 

 This suggestion may be confirmed by the presence of pebbles or inclu- 



