320 BULLETIN OF THE 



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

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

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

 author suggests that the Hudson series 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 (PI. 38, fig. 14, here 

 fig. 10) at Catskill shows conformity. 



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

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

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

 resting unconformahlij 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 

 physical 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., 1856 (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 Helderberg range." (p. 178.) In the 

 Mohawk valley, these formations approach conformity. South westward 

 to Alabama there is neither lapse of formations nor unconformity, 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, 11. (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 either highly inclined and folded, or give evidence 

 of disturbance and partial metamorphism, w^hile the overlying strata 

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

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

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

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



E. Emmons. Agriculture of New York. Albany, 1846, 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. 136, here figs. 12, 

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

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



JaiBes HalL Paleontology of New York, Vol. II. Albany, 1852. 



