146 



this continent at the beginning of the Carboniferous 

 period. 



The Horton corresponds to the Pocono ("Vespertine"), 

 which certainly is in part, at least, contemporaneous, in 

 the central Appalachian trough, to the Cape Dyer beds, 

 in the Cape Lisburne region of northwestern Alaska, to 

 the coal-bearing basal Lower Carboniferous of Spitzbergen, 

 Bear island, and Greenland, and probably to the lower 

 portion of the Calciferous Sandstone series of Scotland. 



THE WINDSOR SECTIONS. 



GENERAL DESCRIPTION. 



The sections about Windsor are so disturbed, discon- 

 nected and obscured with drift, that detailed field relations 

 cannot as yet be given. The series comprises several 

 hundred feet of soft brick-red and greenish-grey marls, 

 interbedded with zones of gypsum and limestone, lying 

 unconformably beneath deposits of Riversdale-Union age. 

 Some of the limestone beds are of considerable thickness, 

 while others occur as thin beds or zones between the shale 

 or gypsum. The latter outcrops over a considerable 

 portion of the area and has been extensively worked for 

 many years. The type section of the Windsor limestones 

 has been generally considered to be that exposed on the 

 Avon river below the Windsor bridges. This section, 

 however, has been given a prominence quite above its 

 actual value in stratigraphy, as it is not only broken 

 but also minutely deformed, so that the relations can 

 only be appreciated by working in the mud at low tide. 

 The accompanying section attempts to show the general 

 relations of the rocks. The folding and faulting is locally 

 very marked and the incompetent, yielding shales exhibit 

 numerous pitching folds of small amplitude, frequently 

 broken by small thrusts and with axial trends commonly 

 parallel to the strike of the beds, while the thinner beds 

 of sandstone or dolomite seem often to have yielded by 

 brecciation in the closely mashed shales. 



The Avon river marls and dolomitic limestones are 

 separated by a thick zone of gypsum from the overlying 

 Miller's Quarry dolomite beds. The latter at their full 

 development are about 35 feet (7-6 m.) in thickness, 

 lying between two zones of gypsum. Their contact with 



