subsurface geology and coal resources of the pennsylvanian system ...

CONTENTS
INTRODUCTION
BY GILBERT H . CADY
Key beds .................................................................................... 9
Structure maps ............................................................................... 11
Construction of structure maps ............................................................. 11
Structure of the Pennsylvanian beds ........................................................ 12
Workable coal beds ........................................................................... 12
Use of electric logs in determining coal-bed thickness .......................................... 14
Acknowledgments ............................................................................ 14
SUBSURFACE GEOLOGY OF CLAY COUNTY
BY HEINZ A . LOWENSTAM
Introduction ................................................................................. 27
Key Beds ................................................................................... 27
Shoal Creek limestone ..................................................................... 27
West Franklin limestone .................................................................. 28
"No . 7" coal bed ......................................................................... 29
No.6coalbed ........................................................................... 30
Harrisburg (No. 5) coal bed ............................................................... 31
Other prominent Pennsylvanian beds ........................................................... 32
McLeansboro group ...................................................................... 32
Carbondale group ........................................................................ 38
Tradewater-Caseyville group ............................................................... 39
Structure of No . 6 coal bed .................................................................... 41
Divergence of Pennsylvanian key beds .......................................................... 41
Interval between the Shoal Creek limestone and No . 6 coal bed ................................ 42
Interval between the West Franklin limestone and No . 6 coal bed .............................. 42
Interval between No . 5 and No . 6 coal beds ................................................. 43
Stratigraphic relations of the basal Pennsylvanian ................................................ 44
Exploration for oil and gas ..................................................................... 46
Coal resources ............................................................................... 46
McLeansborogroup ...................................................................... 47
"No . 7" coal bed ........................................................................ 47
Carbondalegroup ........................................................................ 47
No . 6 coal bed ........................................................................... 47
No.5coalbed ........................................................................... 49
Tradewater-Caseyville groups .............................................................. 50
Protection of coal beds ........................................................................ 50
SUBSURFACE GEOLOGY OF EDWARDS COUNTY
BY HENRY L . SMITH AND GILBERT H . CADY
Pennsylvanian key beds ....................................................................... 51
West Franklin limestone .................................................................. 55
"No. 7" coal bed ......................................................................... 57
Herrin limestone and Herrin (No.
6) coal bed ................................................ 57
Harrisburg (No. 5) coal bed ............................................................... 58
Other prominent Pennsylvanian beds ........................................................... 58
McLeansborogroup ...................................................................... 58
Beds above the West Franklin limestone ................................................ 58
Beds below the West Franklin limestone ................................................ 59
Carbondale group ..................-. . :...................................................
60
No.5Acoalbed ...................................................................... 60
Beds below No . 5 coal bed ............................................................. 60
Tradewater and Carbondale groups ............................................... - ......... 61
Structure of the Pennsylvanian beds ............................................................ 61
Herrin (No. 6) coal bed ................................................................... 61
Albion fault zone ......................................................................... 62