GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 245 



Feet Inches 



of the beds thin out altogether, and at 

 other times there is a rhythmic swelling 

 and thinning, suggestive of oscillation 

 ripples. A careful examination of the 

 weathered edges of these strata will give 

 one a good impression of the clastic char- 

 acter of these deposits. The wave action 

 is almost as marked in these beds as in 



Fig-. 193 Ripple structure in Manlius. a, lime mudrock; Z), lime sandrock 



any modern deposit of fine sand exposed 

 in road cuttings.^ The bedding of the fine 

 lime mudrocks is such as to fill in by 

 horizontal layers the depression in the 

 lime sandrocks as shown in the annexed 

 diagram [fig. 193]. Layers of lime mud- 

 rocks are eroded to form ripples as shown 

 in figure 194. 

 Thickness of f 8 4 



Fig. 194 Ripple structure in Manlius lime 

 mudrock 



f 6 & f 7 Lime sandrock, in places almost made up of 

 Tentaculites ; Spirifervanuxemi, 

 wath rounded and not very strong ribs 

 occurs, approaching in character S . e r i - 

 ensis 11 



^Some walls of the quarry, however, do not show this feature because 

 they are coated with a layer of calcite, formed there while the wall 

 bounded a joint fissure, by lime brought in in solution. 



