130 = G. W. Hawes—The Greenstones of New Hampshire. 
they were accumulated in quiet waters and consolidated under 
well nigh impossible to distinguish them in hand specimens; 
most careful microscopic study is inconclusive. Although 
only extended observations made in the field can decide 
whether the rocks are truly stratified or intrusive, yet it is 
believed that some characters are given in the descriptions 
beyond which will be of service in their classification. 
The old name “ greenstone” is a good general term to apply 
to the whole group, because the prevailing color of the rocks 
is green; indeed it is so common that the formation has always 
greenstone has now ‘ 
may well embrace all the rocks of the formation. It is intended 
‘ ts Ophen 
properties shows it to be triclinic. Whether it be oligoclase | 
or labradorite is not a matter of great importance, since a Vey 
slight variation in the composition of the sediments would pr” 
duce a change in the species, 
