GEOLOGY OF THE COAST DISTRICT. 



621 



5. Merrimack Group. 



Under this head we may continue the description of the last part of 

 the preceding, or what agrees with it hthologically, but in a different 

 geographical field. This territory embraces all the schists usually re- 

 ferred to the Merrimack series on the south-east side of the principal 

 sienitic range, passing through Exeter, and what lies south-east of the 

 Pelham gneiss. Viewed in its entirety, it may be said to occupy the prin- 

 cipal area between the Exeter and Newburyport ranges of sicnite, as well 

 as that between the two great gneiss areas of Pelham and Andover. This 

 is the typical area of this group, from which the name was derived. The 

 rock is mostly a micaceous quartzite, varying to argillaceous schist, and 

 frequently reminding one of the rock carrying Paradoxidcs in Massachu- 

 setts. We have the following observations of its position : 



Massachusetts. 

 In Andover, along Merrimack river, dip 



50° N. 

 At North Andover, generally, dip 30°-4o° 



north-westerly. 

 In Dracut, south of Peter's pond, dip 60° 



N. 

 At Lawrence post-office, dip 70° N. 80° W. 

 In Methuen, north part, dip 20° N. W. 

 In Bradford, on B. & M. R. R., dip 25° N. 



50° W. 

 In Haverhill, dip generally about N. 60° 



W. 

 In Boxford, dip 25°-6o° N. W. 

 In Salisbury, dip N. W. 



Plaistoiv. 

 At J. Noyes's, in east part of town, dip 80° 



N. 80° W. 

 At S. Calden's, dip 80° N. 80° W. 



Atkinson. 

 Near school-house in east part of town, dip 



50° N. 60° W. 

 Near D. Noyes's, north corner, dip 50° N. 



60° W. 



Hampstead. 

 At S. Harris's, dip S. E. 

 At J. Bradley's, dip vertical, or 80° S. E. 

 At E. Morse's, dip S. 80° E. 

 At S. Dow's, dip S. 80° E. 

 At the town hall, too variable for measure- 

 ment. 

 At J. E. Emerson's, dip 50° N. 30° W. 



Newton. 

 At east part of town, dip 80° N. W. 

 At N. Gould's, dip 55° N. W. 

 At M. Bartlett's, dip 50° N. 70° W. 



Sojith Ki tigs ton. 

 At E. Hunt's, dip S. 60° E. 

 South Hampton. 

 Near west line, dip 85° N. W. 



Seabrook. 

 North of church, dip 80° S. 10° W. 

 Near school-house east of the railroad, be- 

 tween villages, dip 80° N. 

 Hampton Falls. 

 At W. W. Healey's, dip N. W. 

 At Baptist church, dip N. W. 

 South of village, dip S. E. 



