Stratigraphy

 

Start Depth
End Depth
Stratigraphic Unit
Start Depth: 0.00 ft
End Depth: 150.00 ft
Unit: Quaternary 
System
Quaternary 
Series
 
Group
 
Formation
 
Member
 
Submember
 
Start Depth
0.00 ft
End Depth
150.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Sand And Gravel 
Percent
100 
Secondary Lithology
 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 150.00 ft
End Depth: 235.00 ft
Unit: Gilmore City 
System
Mississippian (Subsystem Of Carboniferous System) 
Series
 
Group
Sub-Augusta 
Formation
Gilmore City 
Member
 
Submember
 
Start Depth
150.00 ft
End Depth
235.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Limestone 
Percent
70 
Secondary Lithology
Sand And Gravel 
Percent
20 
Tertiary Lithology
Dolomite 
Percent
10 
Comments
Start Depth: 235.00 ft
End Depth: 337.00 ft
Unit: Iowa Falls Dolomite 
System
Mississippian (Subsystem Of Carboniferous System) 
Series
 
Group
Sub-Augusta 
Formation
Gilmore City 
Member
Iowa Falls Dolomite 
Submember
 
Start Depth
235.00 ft
End Depth
337.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Indistinct Lithologic Break) 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Dolomite 
Percent
60 
Secondary Lithology
Chert/Chalcedony 
Percent
40 
Tertiary Lithology
 
Percent
Comments
Start Depth: 337.00 ft
End Depth: 370.00 ft
Unit: Devonian 
System
Devonian 
Series
 
Group
 
Formation
 
Member
 
Submember
 
Start Depth
337.00 ft
End Depth
370.00 ft
Contact Accuracy
Base Accurate, Top Less Accurate - (Poor Samples, Gap At Contact) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Siltstone 
Percent
75 
Secondary Lithology
Dolomite 
Percent
15 
Tertiary Lithology
Limestone 
Percent
10 
Comments
Start Depth: 370.00 ft
End Depth: 540.00 ft
Unit: Lime Creek 
System
Devonian 
Series
 
Group
Yellow Spring (New Albany) 
Formation
Lime Creek 
Member
 
Submember
 
Start Depth
370.00 ft
End Depth
540.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Indistinct Lithologic Break) 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Limestone 
Percent
60 
Secondary Lithology
Dolomite 
Percent
40 
Tertiary Lithology
 
Percent
Comments
Start Depth: 540.00 ft
End Depth: 830.00 ft
Unit: Cedar Valley 
System
Devonian 
Series
 
Group
Cedar Valley 
Formation
 
Member
 
Submember
 
Start Depth
540.00 ft
End Depth
830.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Dolomite 
Percent
80 
Secondary Lithology
Gypsum/Anhydrite 
Percent
18 
Tertiary Lithology
Chert/Chalcedony 
Percent
Comments
Start Depth: 830.00 ft
End Depth: 870.00 ft
Unit: Coralville 
System
Devonian 
Series
 
Group
Cedar Valley 
Formation
Coralville 
Member
 
Submember
 
Start Depth
830.00 ft
End Depth
870.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Dolomite 
Percent
70 
Secondary Lithology
Gypsum/Anhydrite 
Percent
30 
Tertiary Lithology
 
Percent
Comments
Start Depth: 870.00 ft
End Depth: 975.00 ft
Unit: Little Cedar 
System
Devonian 
Series
 
Group
Cedar Valley 
Formation
Little Cedar 
Member
 
Submember
 
Start Depth
870.00 ft
End Depth
975.00 ft
Contact Accuracy
Top And Base Inaccurate - (Poor Samples, Contact Gap, Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Dolomite 
Percent
77 
Secondary Lithology
Gypsum/Anhydrite 
Percent
20 
Tertiary Lithology
Limestone 
Percent
Comments
Start Depth: 975.00 ft
End Depth: 1150.00 ft
Unit: Maquoketa 
System
Ordovician 
Series
 
Group
 
Formation
Maquoketa 
Member
 
Submember
 
Start Depth
975.00 ft
End Depth
1150.00 ft
Contact Accuracy
Base Accurate, Top Less Accurate - (Indistinct Lithologic Contact) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Chert/Chalcedony 
Percent
50 
Secondary Lithology
Dolomite 
Percent
30 
Tertiary Lithology
Limestone 
Percent
20 
Comments
Start Depth: 1150.00 ft
End Depth: 1355.00 ft
Unit: Galena 
System
Ordovician 
Series
 
Group
Galena 
Formation
 
Member
 
Submember
 
Start Depth
1150.00 ft
End Depth
1355.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Limestone 
Percent
85 
Secondary Lithology
Dolomite 
Percent
10 
Tertiary Lithology
Chert/Chalcedony 
Percent
Comments
Start Depth: 1355.00 ft
End Depth: 1405.00 ft
Unit: Decorah/Platteville Undiff. 
System
Ordovician 
Series
 
Group
Galena 
Formation
Decorah/Platteville Undiff. 
Member
 
Submember
 
Start Depth
1355.00 ft
End Depth
1405.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Limestone 
Percent
80 
Secondary Lithology
Shale 
Percent
20 
Tertiary Lithology
 
Percent
Comments
Start Depth: 1405.00 ft
End Depth: 1440.00 ft
Unit: Platteville 
System
Ordovician 
Series
 
Group
Galena 
Formation
Platteville 
Member
 
Submember
 
Start Depth
1405.00 ft
End Depth
1440.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Indistinct Lithologic Break) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Sandstone 
Percent
65 
Secondary Lithology
Limestone 
Percent
30 
Tertiary Lithology
Dolomite 
Percent
Comments
Start Depth: 1440.00 ft
End Depth: 1481.00 ft
Unit: St. Peter Sandstone 
System
Ordovician 
Series
 
Group
Ancell 
Formation
St. Peter Sandstone 
Member
 
Submember
 
Start Depth
1440.00 ft
End Depth
1481.00 ft
Contact Accuracy
Base Accurate, Top Less Accurate - (Indistinct Lithologic Contact) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Sandstone 
Percent
40 
Secondary Lithology
Limestone 
Percent
30 
Tertiary Lithology
Shale 
Percent
30 
Comments
Start Depth: 1481.00 ft
End Depth: 1685.00 ft
Unit: Shakopee 
System
Ordovician 
Series
 
Group
Prairie Du Chien 
Formation
Shakopee 
Member
 
Submember
 
Start Depth
1481.00 ft
End Depth
1685.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Indistinct Lithologic Break) 
Penetration
Complete Penetration, Gaps, Top & Base Defined 
Primary Lithology
Dolomite 
Percent
97 
Secondary Lithology
Sandstone 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 1685.00 ft
End Depth: 1848.00 ft
Unit: Oneota 
System
Ordovician 
Series
 
Group
Prairie Du Chien 
Formation
Oneota 
Member
 
Submember
 
Start Depth
1685.00 ft
End Depth
1848.00 ft
Contact Accuracy
Base Accurate, Top Less Accurate - (Indistinct Lithologic Contact) 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Dolomite 
Percent
99 
Secondary Lithology
Chert/Chalcedony 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 1848.00 ft
End Depth: 1855.00 ft
Unit: Coon Valley 
System
Cambrian 
Series
 
Group
 
Formation
Jordan 
Member
Coon Valley 
Submember
 
Start Depth
1848.00 ft
End Depth
1855.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Dolomite 
Percent
99 
Secondary Lithology
Sandstone 
Percent
Tertiary Lithology
 
Percent
Comments
Start Depth: 1855.00 ft
End Depth: 1883.00 ft
Unit: Jordan 
System
Cambrian 
Series
 
Group
 
Formation
Jordan 
Member
 
Submember
 
Start Depth
1855.00 ft
End Depth
1883.00 ft
Contact Accuracy
Top & Base Accurate For Sample 
Penetration
Complete Penetration, No Gaps 
Primary Lithology
Sandstone 
Percent
50 
Secondary Lithology
Dolomite 
Percent
50 
Tertiary Lithology
 
Percent
Comments
Start Depth: 1883.00 ft
End Depth: 1980.00 ft
Unit: St. Lawrence 
System
Cambrian 
Series
 
Group
 
Formation
St. Lawrence 
Member
 
Submember
 
Start Depth
1883.00 ft
End Depth
1980.00 ft
Contact Accuracy
Top Accurate, Base Less Accurate - (Poor Samples, Gap At Contact) 
Penetration
Partial Penetration (Base Not Met), No Gap At Top 
Primary Lithology
Dolomite 
Percent
100 
Secondary Lithology
 
Percent
Tertiary Lithology
 
Percent
Comments