R. S. Lull — Life of the Connecticut Trias. 421 



genera and species of the footprints of the Trias ; while 

 equivalent beds, mainly from South Hadley southward to 

 Manchester, Connecticut, have yielded all of the osseous dino- 

 saurian remains. One is impressed with the profusion of trails 

 which imply swift motion, as though conditions were hard and 

 life the antithesis of one of languorous ease, the principal fea- 

 ture which gives rise to the belief of locally increasing aridity 

 of climate. 



Here more than in any other act of paleontological history 

 one is conscious of an obscuring drop scene in the middle dis- 

 tance, behind which may be seen with tantalizing clarity the 

 passing and repassing feet of a great host of players : some 

 rapidly, as though impelled by urgent impulse ; others slow- 

 moving, ponderous, the like of which the paleontologist has 

 never seen. Occasionally one passes before the curtain and 

 there, while fully exposed to our scientific vision, a tragedy 

 is enacted, for bones are ever symbolical of death ; but the foot- 

 prints are those of creatures in the full tide of life. 



Bibliography. 



Barrell, J. 1908. Studies for students : Eelations between climate and ter- 

 restrial deposits ; Jour. Geol., XVI. 159-190, 255-295, 363-384. 

 Chamberlin, T. C, and Salisbury, R. D. 1906. Geology, Vol. Ill, Earth 



History, Mesozoic, Cenozoic, I-XI, 1-624, figs. 270, New York. 

 Davis, W. M. 1898. The Triassic formation of Connecticut ; U. S. Geol. 



Surv., 18th Ann. Rept., Pt. II, 9-192, pis. I-XX, figs. 1-52. 

 Eastman, C. R. 1911. Triassic fishes of Connecticut ; Bull. 18, Conn. Geol. 



and Nat. Hist. Surv.. 7-75, pis. I-XI, figs. 1-8. 

 Emerson, B. K. 1898. Holyoke folio, Massachusetts-Connecticut ; U. S. 



Geol. Surv., Geol. Atlas of U. S., folio No. 50. 



1900. A new bivalve from the Connecticut river Trias ; Amer. 



Jour. Sci. (4), X, 58, 1 fig. 

 Fenner, C. N. 1908. Features indicative of physiographic conditions pre- 

 vailing at the time of the trap extrusions in New Jersey ; Jour. 



Geol., XVI, 299-327, 16 figs. 

 Hitchcock, C. H. 1889. Recent progress in ichnology ; Proc. Boston Soc. 



Nat. Hist., XXIV, 117-127. 

 Hitchcock, E. 1858. Ichnology of New England, 1-220, pis. 60. Boston. 



1865. Supplement to the ichnology of New England, I-X, 



1-96, pis. I-XX, Boston. 

 Huntington, E. 1907. The pulse of Asia, Boston. 



1911. Palestine and its transformation, Boston. 

 Lull, R. S. 1904. Fossil footprints of the Jura-Trias of North America ; 



Mem. Boston Soc. Nat. Hist., V, 461-557, lpl., 34 figs. 



1910. Dinosaurian distribution ; Amer. Jour. Sci. (4). XXIX, 



1-39, 10 figs. 

 Newberry, J. S. 1888. Fossil fishes and fossil plants of the Triassic rocks 



of New Jersev and the Connecticut valley; U. S. Geol. Surv., 



Mono. XIV, I-XIV, 1-152, pis. I-XXVI. 



Am. Jour. Sci.— Fourth Series, Vol. XXXIII, No. 197.— May. 1912. 



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