Analytical Abstracts of Current 

 Literature. 



Eastern Boundary of the Connecticut Triassic. By VV. M. Davis and 

 L. S. Griswold. Bull. Geol. Soc. Amer., Vol. 5, pp. 515-530. 

 April, 1894. 

 Some New Red Horizons. By Benjamin Smith Lyman. Proc. Amer. 

 Philos. Soc, Vol. 33, pp. 192-215. June, 1894. 



The "Triassic" of Davis and Griswold and the "New Red" of Lyman 

 are the same series of strata, the series for which Redfield proposed the non- 

 committal name " Newark." 



The first paper is introduced by an outline of the geologic history of the 

 district, the main points of which had been previously published by Davis. 

 The Triassic beds were deposited unconformably on crystalline and metamor- 

 phic rocks to a depth of at least 11,000 or 12,000 feet. Their sequence is 

 interrupted by trap sheets, partly contemporary and partly intrusive. They 

 were uplifted, faulted, tilted and degraded, being reduced to base level in 

 Cretaceous time. Uplift and further extensive degradation followed in Tertiary 

 time, and the work of Pleistocene ice modified topographic details. 



The eastern boundary of the Triassic area is determined by five faults. 

 Three trend north and south and have downthrow to the west. Two trend 

 northeast and southwest, intersecting the others, and have downthrow to the 

 northwest. Points of intersections are marked by two salient and reentrant 

 angles in the boundary. The transverse faults are identified with faults 

 observed in the centre of the area and there found to involve displacements 

 of 2,000 and 1,000 feet respectively. One of the meridinal faults shows a 

 maximum displacement of not less than 9,000 feet. Great pains are taken to 

 explain the nature of the evidence on which these results are founded. 



The second paper is based primarily on a minute survey of the New Red 

 in Montgomery and Bucks Counties, Pa., where the series is composed of five 

 formations, the Pottstown (youngest), Perkasie, Lansdale, Gwynedd and 

 Norristown, with a total thickness of at least 27,000 feet. The formations dip 

 toward the northwest and their outcrops are partly duplicated by a great fault 

 (described in an earlier article by the same author). Their representatives 

 are conjecturally identified in other counties and states, partly from strati- 

 graphic descriptions, partly from structural studies conducted by comparing 

 reported dips with topographic details represented on the contour maps of 



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