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320 



BULLETIN OF THE 



places so nearly m contact, and unconformable, as to leave scarcely a 

 doubt that they were really unconformable" (p. 374); and they arc so 

 shown in his section on Esopus Creek (PL 7, fig. 9, hero fig. 9) ; the 

 author suggests that the Hudson sci'ies may have been disturbed first 

 only to the east of the ''anticlinal axis," and, later, to the west with the 

 overlying formations (p. 374). But his section (PL 38, fig. 14, hero 

 fig. 10) at CatskOl shows conformity. 



H. D. Rogers. Second Annual Report on the Geological Exploration 

 of the State of Pennsylvania. Plarrisburg, 1838. The sandstone and 

 conglomerate of IV. (Oneida and Medina) are " displayed near Eondout, 

 resting tinconformahlg and with a gentle inclination upon the steeply 

 uptilted, contorted, and disrupted strata of the immediately subjacent 

 slates" (p. 37). In Pennsylvania, the conglomerate at the base of IV. 

 contains fragments of the three earlier formations, showing a violent 

 pfiysical change; but no unconformity was noted there (p. 36). 



The same. On the Correlation of the North American and British 



Palaeozoic Strata. Brit. Assoc. Rep., 185G (178-180). *' Undulated 

 Matinal rocks support horizontal Niagara or Scalent strata, with a lapse 

 of two intermediate formations for some distance from the Hudson, 

 westward along the base of the Helderbcrg range." (p. 178.) In the 

 Mohawk vallev, these formations approach conformity. Southwcstward 



to Alabama there is neither lapse of formations nor unconfornuty, but 

 a violent change in the rocks in passing from Hudson River to Medina 

 strata ; the latter contain fragments of earlier formed layers. 



The same. Geology of Pennsylvania, 1858, II. (784-787). *' From 

 Gaspe on the Gulf of St. Lawrence, S. W. to the River Hudson, wherever 

 the Matinal rocks appear in contact with any of the superposed forma- 

 tions, the former are cither highly inclined and folded, or give evidence 

 of disturbance and partial metamorpliism, while the overlying strata 

 display much less displacement and alteration." (p. 785.) Beeraft's 

 Mountain and Rondout (fig. 11, here copied from Vol. II. p. 785) arc 

 mentioned as points where the unconformity is distinct. It is said to 

 exist "from Rondout to Selioharie" (p. 785). 



E. Emmons. Agriculture of New York. Albany, 1840, I. The sec- 

 tions in the gorge of the Catskill at Austin's Mill and at Becraft's 

 Mountain are drawn showing a conformable sequence of Waterlime on 

 Hudson River layers (his sections 5, PI. XX. and p. 130, here figs. 12, 

 13) ; at Rondout, the reljition is represented as unconformable by fault- 

 ing (fig. 17, p. 134, here fig. 14). 



James Hall. Palaeontology of New York, Vol. II. Albany, 1852. 



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