188 Dale — Geology of the North End of the Taconic Range. 



Manor, and three- fifths of a mile E.S.E. of Sudbury Church, 

 and again, apparently, in a badly weathered condition, one and 

 one-fourth mile E.N.E. of Huff pond on the east side of the Cam- 

 brian belt ; by the presence of typical schists of the Taconic 

 range at the most northern summit of that range, three miles 

 S.S.W. of Brandon village (elevation 1295 ft.); by indications 

 of Ordovician fossils (Crinoid stems, etc.) in a small mass of 

 included limestone, a mile JST.N.W. of that hill;* and by the 

 presence of graphitic sericite schist, so common at the base of 

 that schist formation in Vermont and Massachusetts, in the 

 small strip JST.E. of Hincum pond. These age determinations 

 are furthermore corroborated by a dominant, though not 

 universal, N.E. strike in the Cambrian slates, and an almost 

 equally prevalent !N~. or N.15W. or N.N.W. strike in the 

 Ordovician schists and in the underlying limestone. 



The structural relations of the formations are shown by sym- 

 bols on the map and by the section above it, Plate XL It will be 

 noticed that the parallelism between the strike of the Cambrian 

 and Ordovician, already referred to as characteristic of the slate 

 belt to the south, still persists on the west side of the Cambrian 

 slates near Horton and Burr ponds ; but within a mile of Hyde 

 Manor a marked divergence begins to appear, the Cambrian 

 striking more or less N.E., the Ordovician N.15-25W. ;f and this 

 continues to the extreme N. end of the mass. The prevalent strike 

 of all the rest of the Cambrian area is about N.E.; exceptionally, 

 however, as east of Huff pond, possibly owing to a minor pitch- 

 ing fold or a small fault, a few JST.W. strikes appear, and there 

 may be others. The Ordovician schists of the east side of the 

 Cambrian tongue are likewise marked by a N. 15-25 W. strike. 

 This, indeed, is the trend and strike of the Taconic range 

 as far south as West Rutland, eleven miles from the south edge of 

 the map. A similar strike also appears in the limestone 

 of the valley towards Brandon. But to this N.N.W. strike of 

 the Ordovician there is also an exception, for the schists of the 

 west side of the schist mass E. and EVE. of Stiles Mountain 

 strike N.E. and a similar strike appears at several points in 'the 

 limestone embayment east of the Cambrian. The cause of these 

 N.E. strikes in the Ordovician is not apparent, unless it be a 

 system of transverse folds like that occurring on the north end 

 of Mount Anthony in Bennington. A mile N.E. of the Cam- 

 brian point the limestone resumes the normal strike of the Green 

 Mountain region, and this recurs again at Leicester Junction, 

 two miles north of the map. To all this should be added that 

 the Cambrian slates have here and there a secondary cleavage 

 foliation, striking N.15W.,i. e. parallel to the strike of the bed- 

 ding of the Ordovician schist. 



* Locality marked F on map. f Exceptionally also N„ — N.15E. 



