No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 43 



The stratiform structure in erupted rocks due to the arrangement of 

 the elements in a flowing and imperfectly liquid material; well shown 

 in a specimen from Groton, Connecticut, in which a large angular 

 fragment of strongly banded micaceous gneiss is inclosed in a fine- 

 grained eruptive granite. 



T70. Hunt, T. S. 



Special report on the trap dikes and Azoic rocks of 

 southern Pennsylvania. Pt. I. Historical introduction. 



Geol. Surv. Pennsylvania (2), Rept. E, xxix, 253 pp., 

 Harrisburg, 1878. 



The state geologist of Pennsylvania asked Mr. Hunt to " collate all 

 the known, supposed, and suspected facts of American Azoic Geology." 

 The result is a history of pre-Silurian geology, and an attempt to 

 reconcile divergent views. \'arious views regarding the Taconic 

 rocks, Stockbridge limestone, etc., of western Connecticut are dis- 

 cussed without arriving at definite conclusions. 



171. Hunt, T. S. 



Geology. 



Smithson. Rept., 325-345, 1882. 



Review of the progress of geology for 1882. Mention of the Con- 

 necticut Triassic as described by Davis — sandstones and shales, trap 

 rocks (dikes, intruded sheets, extrusive flows). 



T72. Hunt, Thomas Sterry. (1826-1892.) 



Biography. 



Frazer: Am. Geol., xi, 1-13, 1893. 



Can. Rec. Sci., v, 145-149, 1892-3. 



173. Jackson, C. T. 



Observations on the age of the sandstone of the United 

 States. 



Boston Soc. Nat. Hist., Proc, iii, 3^5-336, 338-339. 

 1850. 



Mention of the similarity of the sandstones of Nova Scotia, Maine, 

 Massachusetts, Connecticut, and New Jersey. Notice that the trap 

 comes up as beds rather than dikes, always between the strata of 

 sandstone, never through them; amygdaloidal character noticed; the 

 sandstone is referred to the Silurian, and is held to be related to 

 the Lake Superior sandstone. 



J74. Johnston, J. 



Notice of some spontaneous movements observed in 

 the sandstone strata in one of the quarries at Portland, 

 Connecticut. 



Am. Assoc. Adv. Sci., Proc, viii, 283-286, 1855. 



Description of special cases where the sandstone strata moved sud- 

 denly about ^ of an inch on being partially cut through in quarrying; 

 movement takes place only in the general direction of north and south. 



(See Niles, 225.) 



