ILLUSTRATIONS IN PART II. 
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Plate III. A, Cleaved andesite, Edmunds Hill; B, HobartHill; massive andes- 
ite exposed by erosion 101 
IV. Map of Aroostook volcanic area 105 
V. A, Spherulitic rhyolite from Haystack Mountain; B, Vesicular lava 
from Haystack Mountain 107 
VI. A, "Birch bark" weathering of rhyolite; B, Transverse section of 
same 108 
VII. A, Andesitic lava; B, Andesitic breccia 112 
VIII. A, Fine-grained Sheridan sandstone; B, Sheridan sandstone 132 
IX. A, Conglomerate of the Sheridan sandstone series; B, Sandstone from 
Madawaska Lake 134 
X. A, Railroad cut at Houlton, showing slated Aroostook limestone; 
B, Railroad cut at Timony road, showing folded and faulted 
Aroostook limestone 140 
XI. A , Banded limestone ; B, Aroostook limestone 142 
XII. A, Mapleton conglomerate; B, Manganiferous iron slate 144 
XIII. A, Perlitic type of rhyolite; B, Area between spherulites, perlitic 
type of rhyolite 158 
XIV. A, Vesicular lava; B, Volcanic tuff 160 
Fig. 2. View of Haystack Mountain 107 
3. Diagram of Haystack Mountain 109 
4. Section on Mapleton -Presque Isle road 113 
5. Map of part of Mapleton Township, showing the teschenite area 116 
6. Map of Castle Hill area 120 
7. Section at Mars Hill 135 
8. Section through Winslows Hill 137 
9. Microcline and orthoclase intergrowth 149 
10. Zonal intergrowth of microcline and orthoclase 150 
11. Optical measurements of a plagioclase crystal 182 
99 
