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THE JOURNAL OF GEOLOGY. 



of gneiss and granite, probably of pre -Paleozoic age, which are 

 now much folded, faulted and crumpled. Between these two 

 areas of crystallines is a lowland belt of Triassic sandstone and 

 shale, twenty to twenty -five miles wide, extending from New 

 Haven north through the center of the state and including in its 



3 The rough diagrams accompanying this paper may aid the reader who is unac- 

 quainted with the details of the region under discussion. The abbreviations on the 

 above figure are as follows : C. The Connecticut. Cr. PI. Crystalline plateau 

 (the shaded area). F. The Farmington. H. Hartford. Ho. The Housatonic. 

 Lm. Limestone area. M. Meriden. Mi. Mill River. Mt. Middletown. N. 

 The Naugatuck. N. H. New Haven. No. The Norwalk. Q. The Quinnipiac. 

 Qg. The Quinnebaug. S. The Scantic. Sa. The Saugatuck. T. Tariffville. 

 Th. The Thames. The unshaded area is the Triassic sandstone lowland, and the 

 blackened areas represent the ridges of the faulted trap sheets. 



borders New Haven, Meriden, Hartford, New Britain and many 

 towns of lesser note. These sandstones form a monocline with 

 an eastward dip of I0° to 30°, and in addition to being tilted they 

 have been faulted since their deposition in a shallow, slowly - 

 subsiding trough of crystallines. Their thickness is variously 

 estimated — 3,000 to 5,000 feet, Dana; 10,000 or more, Davis. 



