Series: U.S. Geological Survey Miscellaneous Geologic 

 Investigations Map 1-327 



Date: 1961 



Regional mapping of surficial glacial features at 1:500,000 scale 

 shows the Long Lake wetland near a mapped ice-marginal limit 

 passing through Sunburst. Willshaw Flats appears to be shown as 

 an upstream part of a major mapped drainage way connected southward 

 to the Marias River valley. 



Bibliographic source: None, default reference 



Author: Ross, Andrews and Witkind 



Title: Geologic map of Montana 



Series: None 



Date: 1955 



Regional compilation at 1:500,000 scale shows the basin underlain 

 by Colorado Shale of late Cretaceous age. Mapping at this scale 

 provides no information regarding surficial deposits. Field 

 observations indicate the area is underlain by glacial and 

 lacustrine deposits of unknown thickness. 



Mallara popq 



Bibliographic source: Montana Bureau of Mines and Geology 

 Publications Index 



Author: Bergantino, R.N. 



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

 degree quadrangle. 



Series: MBMG Open-file report 171 



Date: 1986 



Regional compilation at 1:250,000 scale shows the glacial deposits 

 of the wetland site to be underlain by undifferentiated Fort Union 

 Formation of early Tertiary (Paleocene) age. 



Bibliographic source: Montana Bureau of Mines and Geology 



47 



