1916] The Ottawa Naturalist. 35 



Classification of Intraformational Glomerates. 

 .4 . Present structure contemporaneous with primary lithification. 



I. Shape of phenoclasts not dependent upon transporta- 



tion and attrition. 



a. Endolithic breccias (mud-crack breccias.) 



b. Bioglomerates. 



1. Result of animal (?) activity. 



(a) " Strephochetal " glomerates. 



(b) "Wingia" glomerates. 



2. Result of vegetable activity. 



(a) "Corosion" glomerates (formed by algae). 



(b) Algal glomerates (formed from algae). 



c. Gleitungsphenomene ; sub-aquatic-gliding-deform- 



ation "conglomerates." 



1. Lacustrine. 



2. Marine. 



II. Shape of phenoclasts partially dependent upon trans- 



portation and attrition. 



a. Stratified glomerates. 



b. "Edgewise" glomerates. 



B. Present structure non-contemporaneous with primary lithi- 

 fication. 



I. Present structure partially previous to primary lithi- 



fication. 



1 . Shape of phenoclasts entirely dependent upon trans- 



portation and attrition. 



a. Limestone conglomerates. 



b. Mixed conglomerates. 



2. Shape of phenoclasts not affected by transporta- 



tion and attrition. 

 a. Cliff breccias. 



II. Present structure subsequent to primary lithification. 



1. Tectibreccias. 



2. Enterolithic breccias. 



3. Ice-formed breccias. Formed by 



a. Icebergs. 



b. Continental glaciers. 



1. Result of shove. 



2. Result of thaw. 



Endolithic Brecciation, (see Grabau, p. 777). Mud- 

 crack breccias. 



Mud cracks are found to be of much commoner occurrence 

 in the Cambrian and Ordovician limestones than was formerly 

 supposed. Where there was a shallowing of the Ordovician 

 seas so as to permit intermittent periods of dessication, mud- 

 cracks are well developed over wide areas, and for a stratigraphic 



