coos AND ESSEX DISTRICT. 



83 



COoS GROUP. 



241, 243, 244, 247, 24S, 250, Calciferous 



mica schist. 

 240, Mica schist. 

 249, Siliceous limestone. 



264, Argillaceous mica schist. 

 239, Protogine — intrusive. 



265, Sienite. 



266, 267, Limestone. 



268, Mica schist with limestone. 



HURONIAN GROUP. 



271, Dark gray mica schist. 



275, Argillaceous mica schist. 



276, 277, Arenaceous mica schist. 



280, 285, 287, 2S8, Mica schist. 

 284, Pyritiferous mica schist. 

 286, Chloritic schist. 



278, Gneiss. 



281, Fine-grained gneiss, rich in quartz. 



282, Fine-grained gneiss. 



272, 279, "Trap" — intrusive. 



269, 270, Sienite — intrusive. 



283, Granite. 



385, Granite. 



386, Siliceous schist. 



Verniont. 

 289, 290, Mica schist. 



291, Argillaceous mica schist. 



292, Granite. 



293, Fine-grained, reddish granite. 



294, 295, Mica schist. 



296, Contorted mica schist. 



297, 298, Mica schist. 



299, 301, Hornblende schist. 



300, Dark gray gneiss. 



302, 303, 304, 305, 306, 307, Gray siliceous 

 schist. 



308, Gray siliceous schist. 



309, Gray siliceous schist. 



310, 311, Fine-grained mica schist. 

 312, Chloritic schist. 



313, Chloritic hornblende schist. 



314, Quartz. 



3!5' 316, 317, 320, 322, Granitic gneiss. 



318, Granite. 



319. 325, 330, Hornblende schist. 

 321, Granular Cjuartz. 



323, 326, Gneiss. 



324, Siliceous slate. 



327, Grayish-black quartzite. 



328, Quartzite — plumbaginous. 



329, Grayish-black siliceous slate. 



MOXTALBAN GROUP. 



331, Coarse, dark-grayish gneiss. 

 33-' 333' Coarse grayish gneiss. 

 334' 335' 337' Dark grayish gneiss. 

 336, 338, Granitic gneiss. 

 339, 340, 341, Grayish gneiss. 



HURONIAN GROUP. 



342, Light-gray siliceous schist. 



343, 344, Gray siliceous schist. 



345, Hornblende schist. 



ATLANTIC SERIES. 



346, 347, 349, 352, Common gneiss. 

 348, Protogine gneiss. 



351, Hornblende schist. 



HURONIAN GROUP. 



353' 354' 358' 359' 362, 363. 364, 365, 366, 

 Gray siliceous schist. 



355, Mica schist. 



356, 361, 367, Hornblende schist. 



357, Argillaceous mica schist, with acicu- 

 lar crystals of hornblende. 



360, Hornblende gneiss. 



368, Granitic gneiss. 



369, Dark gray gneiss. 



MONTALBAN GROUP. 



370, 387, Fine-grained gneiss. 



371, Greenish-drab siliceous schist. 



372, Dark gray gneiss. 



