58 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



245. Ries, H. 



Clays of the United States, east of the Mississippi river. 



U. S. Geol. Surv., Prof. Paper No. 11, 1-287, 1903. 



Clays of Connecticut, and analysis of kaolin found at West Cornwall; 

 clay-working industry around Berlin, Hartford, New Haven, and Mid- 

 dletown; value of clay products in the State. 



245a. Robinson, H. H., and Gregory, H. E. 



Preliininary geological map of Connecticut. 

 Connecticut State Geol. Nat. Hist. Surv., Bull. No. 7, 

 39 pp., I fig., together with a geological map, 1906. 



(See Gregory and Robinson, 124c.) 



246. Rogers, H. D. 



Nature of the dip of the Triassic of the eastern United 

 States. 



Am. Jour. Sci., (r) xliii, 170-171, 1842; Assoc. Am. Geol., 

 Trans., 63-64, 1843. 



Brief statement to the effect that the dip of the Connecticut sandstone 

 is the result of oblique deposition. This objected to by Lyell and 

 Silliman. The latter mentions upheaval as the cause. 



247. Rogers, H. D. 



Cause of crescent-formed dikes of trap in New Jersey 

 and Connecticut. 



Am. Jour. Sci., (i) xlv, 334, 1843. 



Brief statement that the crescent form of the trap dikes is in 

 some manner connected with the dip of the stratified rocks which 

 they traverse. 



248. Rogers, H. D. ^ 



Sketch of the geology of the United States. 

 Geol. Pennsylvania, ii, 741-775, Philadelphia, 1858. 

 The geology of New England and of the Connecticut valley is briefly 

 compared with that of other regions. 



249. Russell, I. C. 



On the physical history of the Triassic formation in 

 New Jersey and in the Connecticut valley. 

 New York Acad. Sci., Ann., i, 220-254, 1879. 



Description of the Triassic areas of eastern United States, par- 

 ticularly those in New Jersey and Connecticut. Conclusions: i. The 

 Triassic beds are the borders of one great estuary deposit, the central 

 part of which was slowly upheaved and then removed by denudation; 2. 

 The outbursts of trap must have occurred after the sedimentary beds 

 had been upheaved and eroded; 3. The detached areas of Triassic rock 

 occvirring along the Atlantic border from New England to North Caro- 

 lina seem fragments of one great estuary formation, now broken 

 up and separated through the agency of upheaval and denudation. (See 

 Dana, 46.) 



