19 
flowing of liquid lava over unconsolidated sediments. And the 
attention of those who may see in the minor unconformities of 
the contact evidence that the melaphyr is really intrusive is 
“Шей to the fact that no detached fragments of the tuff or sedi- 
ment are observed in the base of the melaphyr. 
MELA Fl Ye A 7 
Fic. 2.— CoNTACT or TUFF AND MELAPHYR AT THE 
NORTHERN BASE OF ATLANTIC HILL. 
Wund i INCH 5912 PET. 
The thickness of the melaphyr, near the bath house, is about 
twenty feet ; and it appears to increase eastward. This is very 
clearly a second lava-flow, and not an intrusive bed; and in 
lithological character it is very similar to the first, being chiefly 
dark green | | 
and compaet. It is sometimes, however, more brec- 
Clated ; 
but exhibits the same ill-defined segregations and veins 
Oh (тау. t 5 
f quartz and epidote. This flow can be traced eastward along 
Ü “Q И d ° 7 / Ç 
he base of Atlantic Hill to V alley Beach, between Atlantic and 
entre Hills; and it undoubtedly forms the landward end of the 
9w-tide ledge north of Centre Hill. 
Valley Beach is bounded by two good transverse sections of 
the formations. 
Atlantic Hill ends here in a small cliff, which 
shows the 
т ^ 
following thicknesses from below upwards (Fig 
16 second melaphyr, already described, about 30 feet; 
Volcanic agglomerate and tuff, 7 feet; melaphyr, 9 feet; ag- 
slomerate and tuff, 25 feet; and then melaphyr extending 
Southward indefinitely, or beyond the end of the section. 
lí Y ` Ú mn . . 
The first fragmental bed or tuff in this section measures 7 
OCCas, PAPERS. B. 8. N. Н. Iv. 4. 
