Stratigraphy

 

Start Depth
End Depth
Stratigraphic Unit
Start Depth: 0.00 ft
End Depth: 37.00 ft
Unit: Deforest 
System
Quaternary 
Series
Holocene Series 
Group
 
Formation
Deforest 
Member
 
Submember
 
Start Depth
0.00 ft
End Depth
37.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Silt 
Percent
Secondary Lithology
Sand And Gravel 
Percent
Tertiary Lithology
Alluvium 
Percent
Comments
Start Depth: 37.00 ft
End Depth: 91.00 ft
Unit: Dakota 
System
Cretaceous 
Series
 
Group
Fort Benton ("Lower Colorado ") 
Formation
Dakota 
Member
 
Submember
 
Start Depth
37.00 ft
End Depth
91.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Bedrock Surface - Partial Penetration (Base Not Met), Gap At Top 
Primary Lithology
Sandstone 
Percent
70 
Secondary Lithology
Shale 
Percent
30 
Tertiary Lithology
 
Percent
Comments