Stratigraphy

Start Depth
End Depth
Stratigraphic Unit
Start Depth: 0.00 ft
End Depth: 103.00 ft
Unit: Quaternary 
System
Quaternary 
Series
 
Group
 
Formation
 
Member
 
Submember
 
Start Depth
0.00 ft
End Depth
103.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Silt 
Percent
55 
Secondary Lithology
Sand And Gravel 
Percent
45 
Tertiary Lithology
 
Percent
Comments
Start Depth: 103.00 ft
End Depth: 354.00 ft
Unit: Dakota 
System
Cretaceous 
Series
 
Group
Fort Benton ("Lower Colorado ") 
Formation
Dakota 
Member
 
Submember
 
Start Depth
103.00 ft
End Depth
354.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Bedrock Surface - Complete Penetration, No Gaps 
Primary Lithology
Sandstone 
Percent
94 
Secondary Lithology
Shale 
Percent
Tertiary Lithology
Gravel 
Percent
Comments
Start Depth: 354.00 ft
End Depth: 361.00 ft
Unit: Unknown 
System
Unknown 
Series
 
Group
 
Formation
 
Member
 
Submember
 
Start Depth
354.00 ft
End Depth
361.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Partial Penetration (Base Not Met), No Gap At Top 
Primary Lithology
Sandstone 
Percent
90 
Secondary Lithology
Geest 
Percent
10 
Tertiary Lithology
 
Percent
Comments
Paleozoic