782 



PRINCIPLES OF STRATIGRAPHY 



calcareous nature of the material probably insured a partial cemen- 

 tation before the gliding took place. (See Fig. 95, p. 440.) 



C. Triassic examples are known from the Muschelkalk of Ger- 

 many, especially the Main region, but not all of the disturbances 

 found in this formation and so fully described by Reis (20) belong 



Fig. 165. Deformation due to subaqueous gliding, Muschelkalk, Franken 

 (Germany) 1:50. (After Reis.) 



here. The enterolithic structure described by Koken (13) from the 

 Neckar A'alley must certainly be removed from this category of 

 deformation due to submarine glidings. 



D. Devonic examples of this class have been figured by Sir 

 Wm. Logan from the Cape Bon Ami limestones of Lower Devonic 

 age from Gaspe (Logan-15 : jpi") where in division 4 and less 



Fig. 166. Deformation due to subaqueous gliding, Muschelkalk, Franken 

 (Germany) i 150. (After Reis.) ^ 



than 400 feet above the base of the entire series is a bed seven 

 feet thick made up of several thin layers of limestone and limestone 

 shale and presenting a series of wrinkles or contortions from which 

 the overlying and underlying beds are free. ', The series now dips 

 at an angle of 24° southwest. The folding in some cases has been 

 so intense as to cause a brecciation of the limestone beds. (Fig. 167.) 



