undifferentiated glacial deposits extending barely beyond the 

 wetland. No description of the character of glacial deposits in 

 the area is included. 



Up-slope areas within the apparent surface catchment may include 

 mafic metamorphic rocks (metadolerite) of Precambrian W age. 

 Nearby outcrops of Cambrian-aged rocks ( including the Meagher 

 Limestone and other calcareous lithologies) appear to be outside 

 of the surface catchment of the wetland site, but may have 

 contributed material to the glacial sediments exposed at the site 

 surface. 



Comertown Preserve 



Bibliographic source: Montana Bureau of Mines and Geology 

 Publications Index. 



Author: Bergantino, R.N. 



Title: Quaternary geology of the Wolf Point 1 degree X 2 degree 

 quadrangle. 



Series: MBMG Open-file report 172 



Date: 1986 



Regional map compilation (blueline) at approximately 1:250,000 

 scale shows both Comertown and North Widgeon sites underlain by 

 Late Wisconsin(?) till. [Regionally, this till deposit is 

 typically described as having a significant fraction of calcareous 

 material.] Mapping shows some isolated areas underlain by ice- 

 contact stratified drift within the Lone Tree Lake 7.5' quadrangle. 



Bibliographic source: Montana Bureau of Mines and Geology 

 Publications Index. 



Author: Bergantino, R.N. 



Title: Prequaternary geology of the Wolf Point 1 degree X 2 degree 

 quadrangle. 



Series: MBMG Open-file report 171 



Date: 1986 



Regional map compilation (blueline) at approximately 1:250,000 

 scale shows surficial glacial materials of the Comertown Preserve 

 and North Widgeon wetland sites to be underlain by undifferentiated 

 Fort Union Formation of early Tertiary (Paleocene) age. This map 



17 



