-"'.'n' W. II. Emery— Igneous Geology of Carri.ro Mountain. 



its source of supply, than at its outer edge, so that it might be 

 considered a Hat laccolith. However, as it is only 300 feet 

 thick at its deepest point, it has been deemed best'to call it a 

 sill. 



West of North Mesa and between it and Chezhindeza Mesa, 

 there is exposed a mass of igneous material having exactly the 

 same relations to the enclosing beds as the Tisnasbas sill. ' It is 



Fig. 3. 



Fig. 3. Holmes Dike. 



possible that this is an entirely separate intrusion, but because 

 of the very similar character it is thought to be a portion of 

 the Tisnasbas sill, though the connection is not visible due to 

 the overlying mass of North Mesa. 



Intrusive sheets cap both North and Chezhindeza mesas and 

 overlie unconformably sediments of Upper Jurassic (?) age. 

 The sheets evidently are offshoots from the main intrusion and 

 between them and the Tisnasbas sill and its extension the sedi- 

 ments are pinched out. This was noted by Holmes, who says : 



