Bedrock Geology of Southeast Iowa Digital Geologic Map of Iowa Phase 7: Southeast Iowa

92°00' 91°30' 93°00' 92°30' R11W R09W R08W R07W R06W R05W R12W R10W R21W R20W R19W R18W R17W R16W R15W R14W R13W # # ## # # # # # # ## # # # # Ss # # # # # # # # # # # # # # # # # Dw # # Dw # Sg # Dc Dc # # # # # # # # # # Dc Pc # # # # # # # Dw # # # Pc # # # ## Ss # # Df # # # # # # # # # # # # # Dl # # # # # # # ## # # 1 # # # # Pc # # ## ## # Dw óô # Sg # Pc # Pc # # # # # # # # # # # # Dl # Df # JOHNSON # ## # # # # # # Df # # # # Pc # IOWA # # # # Pc Msp # # # # # 380 JASPER # # # Dl # Dc # # . # POWESHIEK # # Msp # # 212 # # -# # # # # , Pc # # ø # # # 965 # # # # # ÷ # Ma # # # # # ÷ø 14 ## # # # ô # e # # # # # # # ó # u # # # # # Sg N # # # # # ## # # # # # # # # # # # n # # # ## o # # # Ss Ss # (65 # # 63 # # # # / # # Pc Ss ( # o # # # / # # # r # Dl # # # # t # # # # # # # # h Z # # # # prepared by Pc 146 # # 382# # # # # # Ma # ÷ø Ma # # # Pc # Dc # # ÷ø # Pc # # # # # # # # # # # # Dc Dl # Pc Dl # # # # # (151 # # # # # # / # # # # # # # # # d # # # # # # # # # # # # # # Df # # # # # # # # # 223 223 # # Dl # # # # # # # # ÷ø Dl # Dc # # # # # ø # ÷ # 2 1 # # # # # # # # # ô # Dw # # # T81N ó # # Dc # # # # # # # T81N # # # # Pc # # S Pc # # # # # Pc # # # # # # # # Dw # # # ### # # # o # # # # # # # # # # # # # Df Dc # # Dc Sg u # # # # # # # # # # # # Dl Marengo # # # # # # th # # R # # # # Dc # lt Dl # Pc Msp # # iv Msp 212 # # # er 220 u # # # # # # # # # # # Pc # ÷ø # # ÷ø# # # # # # # ## ## #### a # # # Msp Ma # ## # # # # # # # # Dw # Ma Ma # F Dw # # # # # # # # # # # # 117 # # # # # # Brian J. Witzke, Raymond R. Anderson, 65 ø # # # Dc # # # ÷ # ( # # Dc / # I # # # # # o # Pc # Df w # # # a # # Pc Df # # # # # Dl # # Dc # # # # # # # # # # # # # # # # # # # # # Ma # # # # Dl # # Ma # Dc # # # # # # # # # Mk Pc # # # # Ma # # ### # # # Df # # # # ## # # # # # # # # # # # ## # # # # Mk # # # # # # # # # # # # # # # u # # # # # # # # # # # Bill J. Bunker Df # # # Df # # Ss # a# # # # # # Ma # # # ## # # Ma Bear # # n # # # # Ma # # # # # # # # # # # # a ## # # # # # Pc # # Dc # Mk # # # # # # # # # # # # # # # # m # # # # Dc # # Dl # # Pc # ## # Pc # Ma #d # # # # # # # # ## A # # # # # # # Dl # # # # # # # # # # Df # # Msp # # # # # # # # # # # # ## # # # # # ## ## # # # # # # # # # # # # Dl # # # # # Df Pc # # 965 # # # # # # # # # # Dl ø # # # # ÷ # # # # # # Df # # Dc # # # # # # # Df # # # # # # # # # S # # # (6 # # # # # # # # # / # # # # # # Pc 14 # # (6 # Pc # # k 224 / # # ô # # ó # # # ø ## # # Df ## # # # Dw ÷ # # Pc # # # # # # # u # # # # # # # T80N # # # # # # # # # ## # # # # # # # # # # n # # # # # # k # # # Dl ## # # # # e 419 # 380 k ### ###### # # # re ø # . # # # T80N ÷ # # # C # # # - # # , # # # # # # # # # Pc Ma Ma # # Pc # Df # # # 109 # # Pc # Msp # Df # # # ø # # # # # # Dl # # # # # ÷ # # # # # # # # # Df # # # # # # # # # # # # # 1 # Msp # 2 1 # # # ## # ô# # # # Df 151 ó #### ô # Pc # # # # # # # # # ó # ( # # / 6 # # # # # # ( # # ## # / # # 117 Ma # # # Pc r # # # # # # Ma ø # Ma # # a # # # # # # ÷ # Dc # # Df # le # # # # # # # # # C # # # # Mk # # # # # # # # # # Iowa Geological Survey # Dl # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # ## # # # # # # # # # # Pc # # # # # Pc # # Dl # # # # # # # # ########## Pc ### # # # # ## Dl # # ## ## # # # # # # # # Ma # # # # # # # # # # # # C# Dl # # # # # # # # # # # # # Dc re Dw # # # # # # # # ## # # # Pc # # # # Mk Dl # # Pc # # e# # # # # Pc # # ### # # # # # Dl # k # ## # # # # (6 # # # # # # # ## / # # # # # # # # # # # # ## # # 2004 # # # # # # # # # Pc # # # Pc # # # # # # # # # # Dl # # # # ## # # Dc # # # # # # 80 # # # ## # # . # # # # Df # # # # ### # # 6# Pc # # - Df ## # # # # # ## # ( , # # # # / ## # # 80 # # # # ## # # # # ## # . # # # # # # ##### # # - # # # # # 80 # # # # # # , # # # # # # # ## # .# ## # # # ## # # # # # # # # #### ,- # # # # Newton Msp # # #### # # # # # ## # Msp # # # # # # # # # # # # # # # # # # # # # 979 # # # # # # # # # # # # # # # # ø # # # # ÷ # # # # # # # # # # # # # # Pc # # # # # # 80 ## # # # # # # Df ## # # # # # # . # # # # # # Mk # # # # # # #### - Msp ### # # 80 # # # # # ##### # # , Ma # # # # Df # # # # . # # # Pc## # # # # # - # # # # Df # # # # , 146 # 80 # # ## # ø # # # # # ## # # # . # ÷ Dl # # # # # # # # # # # # # ,- ## # # # # # # # # # # # # 218 # # # # # # ## # ## Dc # # Df # ( # # ## # # # # # / # Pc N # # # # ## Iowa # # Ma # # Pc Df # # # # # # # R # # # # # # # # #### # # Pc o # # # # # # # # # # # # # # # # # # Df # # # ## Ss # i # r # # # # # # # # v Msp th # # # # # # # # # # # # # # # Cit#y # u # # Df # Ma # # # # # # # e # # # # # # # # # # # # T79N Pc # # # r # # # 149 # Dl # # # Pc Pc ÷ø Mk # # # # # # # # # # Pc # ## # Pc Msp # # # # # ####### # # # Mk # # Mk # Dc # # # # ##### # # E # Df # # # # # # ### # ng # # e # # li # # Df # # 14 # 63 sh # n ( # /# # # # # # # o # # # # ô # # # # ó # # # # Ma # ## Z # # # Msp # # d # # Pc # T79N 117 # # # # # # # # # # # ø ## # # # # # Df # ÷ # # # # # # # # # # t # # # # l # # # # # # # Dl # # Dl u # # # Dl # a # # # # # # F # # # # # # # # # # # # # # # S # # # # # # # # # # # # # # # # 91°00' # # # Ma Df # Df # # # n Dl # k # # # # # # # o # # Pc Msp # Dl # t # u # # # # # # Mk # ## n # i # # # l # # Pc # # Df # n # # # # # Pc # C # # # # # k Pc # # # # ## # # # - # # Pc Df # - Pc # # # Mk Df # # # # u # # Dc # # # # # ## R01W R01E # # Df # # # Msp # # # # # # # # # # R04W R03W R02W # # # # # # # # # # # y # # # # # t # # # # 2 1 # # Ma i # # # # Ma # # ô # # # Dc n # # # # # ó C # # # # # # # # # # # Ma # Dl # # # a # # # # # Ma # Df # w # (6 # # # / # # o # # O I ld ## # # # # # # Pc Mk Dl d # # ## ### # # # # # # # # # # # # # # # # # # # # # # # Ma # # Pc Pc # # Pc # Mk # # Sg ## 9# 27 # # Pc # # # # # # # # # # # ø ÷ # Pc # # # # # # # Dl # # # # # Pc # # # # # # # ## # # Dc # # # # # # 923 # # # # # # # # ø # # # 163 # Pc ÷ Dc ø # # # # # # # # # Df C # # # # # ÷ # # # # # # r # # ## # # # # # # # # # e # # # Pc # # # # # # # # # # e # # # # # # # # # # # # # # # # # # k # # MUSCATINE # Pc # # # # # # R Df # # # # # # # Msp # # # # # # Dw # # # # # # # # # # # # # # # W # # # # Sh # # # Msp ## # # # # # # # # # Pc # # # # # # i # # Ma # # # # # Pc # # # # # # # # # # Pc ## # # ## # # # # # # # v Dl a # # # # # # # # 85 # # # ## # # # # # # # # # # # ô # # # # # # ##### # # # # ó # # # # # # e p # # # ### # # # # Dl # # # # # # # # Dc # # # (6 Ss # # Mk s / # ## # # # Sg Dc # # Msp # # # Dl r # # ## # # # Ma ## # # # i # # # # # # # # # # # # # # n # # # # # # # # # # # # # # # # # Mk # # o # # # # 225 Df # # # # # # Ma # ÷ø # # # # T78N # # # n ## # # # # # Dw # ## # # # # # Mk Df R # # # # # # # # # o # # # # # # Montezuma # # # # ## # c # # Ma Pc Ma i # 1 Df ## # # # ô # # # # # # # Df # # # # v ó # Pc 163 # # # Pc # # # # # # Sg # # ÷ø # # # # Ma # # # # # # # # # # # Df e # # # # Pc # ## # Msp # # # Pc # Mk # # Pc # # # r # # # Dl # # # # T78N # # Pc # Ma 149 # # # Dw Pc # # # # # # ø # # # # Dc # # # # # ÷ Pc Pc # # # # # # # 38 Dc # # # # # # # # ô # # # # # ó # # # # # # ## # Pc # # # # # # # # # Pc # # # # # ## # # R Pc # # # # # # # # # # # # # # # # # # Dl # # # iv # # # Pc # # # # # e # # # # # 14 r # # # # # ô Msp # ## # # # # # # # ó # # # # # # # # Ma # # # # # # # # 146 # # # # # Dc # Pc # ÷ø Mk # # Dc # # # # # # # # Pc # # Df Dc Ss # Pc # # # Pc # # # # # # # # # # # Ma Mk # # # # # Pc # # # # # # # # # # (63 # Ma Ma # # # # # # # # Dl # # # / Pc # # # # Msp # Df # 70 # # # # # Df # # # ô Sg # # (6 1 # ó # # / # # # r # # # # # # Pc # # # # # # # # # # # # # # # # # # # # # # Ma # # # # e # 61 # # # # # # # # # # # # ( # # # ## # # # Dc / # # ## # Mk Df # # # # # # # # # # # Ma # # v # # # # # # # Pc ## Pc # # # i Dw # Pc # # # Msp ## Pc # # # # # # # # # # # Msp # ## ## Pc Ma # # # # # # # # # # # ### # # Pc # # # # C # 41°30' # # # # # # # # # # # # # # # # R # # # # # # # # # # # # # Pc Msp Msp # # # # # # # # # # # # ### # # # # # # # # # Mk r # # # Msp # # # Mk # # Df # # # # # # # # # # ## # # # # # Ma # # # # # # e # # # # Df # # # # # # # # # # # # # # # # # # # # # # # # Dc # ## D Mk # # # # # # # # e # # # # # # # # # # # # # 40#5 # # # # e # k # # # # ø Dw # # ## ÷ ## # # # Pc Pc e # # WASHINGTON # # # # # # Mk # # # ## # # # p # # # # # # ## # # # # # Ma # Pc # # # # # # # # # # 41°30' # Pc # # # # 22 # # # # # ## # # # # # # # ô # # # # # # # ó # # # # 146 # # # # Dl # Pc KEOKUK Pc # # # # # # # # ø Msp # # # # # ÷ # # # 149 # # # # # # # # # # # # # # R21W R20W R19W Ma ø # # # # # # # # # T77N ÷ # # # # MAHASKA # # # # ### # # # # Ma # ## # # # # # Pc # # # # # # # # # Mk # # # # # # M# a # Mk # Df # # ## # # # # # # # # # # # Ma # 923 # # # # # # # # # # # ø# # Dc # Pc # # ÷ Dc # R18W # # Df # # Mk # # # # # # # 93°00' # # Dc # # # # # # # # ## # # # # Ss # # ## # er # # # # ## # 70 # ## ## # # v # # # # # # # i Pc # # ô ## # # # # ó # # # # # Msp # R ## # ## # (218 # # # # # Mk # / # # # # # # # # # # # # # # # # # # # # # ## 22 # # # # Pc ## # # # # ## ô # # # # Pc # # # # # ó # # # # ## # # # # # # Pc 102 # # 2 1 Pc # # ## # # # # 22 # ## ## Dl # # ø # # # # # ## # Df # ## # # # ÷ ô # # #ô # ó # # ó ## # # # # # # # # # # # # # # (6 1 # ## # # # # # # / ### # # # Dl # # # # # Ma # # # # # # # # # # # # # # # # # # Ma # # Mk # # # # # # # # # # # Dl Pc # # # # Pc # # # # # 38 # # # # Pc # Msp # # # # # # ô # 22 # # r # # ó # # # # # # Ma # # ô # # # ó # # # Ma # # e # # # # # # # # # # # # # # # Ma # # ## # # ## # # # # # # Dw # # Muscatine # # v # Pc # # Dl # ## i # ## Pc 22 # # # # # # # # Msp # # ô 22 # # # # # # ó # # # # ô # # ## # # R ó # # # # # # # # # # # # # # ## Dw Pc # Df Ma # # # # ## ## # Pc # # # # # # # T77N # # # # # # Mk # # # #### # # # # # # Pc # # ## Ma # Mk # # # # # # # # # # Dc R01E Msp # # Df # # ## ## # # # Df # # ## # # # # # 22 # # # # # # # # # # ## # # Pc # # ô # # # # # # # # Df # # ó # # # Msp Ma # # # # # # # # # # # # Dw # Pc # # # # # # # # # # # # # # Df # # # # # # # # # # # # # # # Pc # # # Pc Ma # # # # Msp Ma Msp # # # # Mk # # # # # Pc # # # # # # # # # # # Pc # # # # # ## # # # # # # # # # # # # R01W # # # # # # # # # # # # # # # Ma # # # # # # # # # # Ma # # # # # Dc # # # # Df # # # # 91°00' # Pc # # ## # # # # # # # # # # # # Ma # # # # # # # # # # # # # # # # # # # LOUI# S# A # # # # # # # # # # Ma # # # # # # # # # # # # # # # #### #### Ma # # # Mk # # # ## # # # # # # # # ## # # Pc Msp # # Pc Ma # # # # # # # # # # # Pc 1 # # # # ######## # # # # Pc # # Pc ô # # # # # ##### # # ó # # # 102 # # # # # # # # # # # # ÷ø # # # # # # # # ## # # # # # # # # # # # # # # # # # ## # # # N # # # # # # # # # # # # ## # # # # Pc Pc ## # Msp # # # # # # # # # # # # o # # # # # # Pc # # # # # # # # # # Df # # JASPER Pc # r # # # # Ma # # # # # # # # # ## t # # # # Df # # Dl # POWESHIEK IOWA JOHNSON # # # h # Msp # # # # # # Pc # # # # # # ## # # # # # # # # # # # # # Msp # Pc # # # # # Ma # # # # # ## # # # # # # # # # ## # # # # # # # # # # # # Pc # Mk # # # # # # # ## # # # # ## # # # ## # 16#3 # # # # # # # # # ## # ##### # ø # # # # # # # # # # # Mk # # # ## ÷ # # # # # # # # # # # # # # # # # # # # # # # # # # # Msp # # # # # # # # # # # T76N ## # # # Pc Msp # # # # # # # # Df # # # # # ## # # # # # ### # # # # # # # # # # # # # # # Pc # # # # # # # Df # # # # # # Pc # # # # # # # ## # # # # # Ma # ## # # # # # # # # # # # # Msp ## # Mk Pc # # # # # # # # Pc # Msp # # # # # Mk # # # # # # # # # # # # # # # # # # # # 149 # # # # #Ma # # # # Df # # # # ## # # # ø ## # # # # # # ## # # Pc ÷ # # # # # Pc # # # # # ## Pc # 2 1 # Msp # # ## # Msp # # # # # # ### Pc ô # # # # # # # ## # # ó # # # # # ### # # # # # # # # (6 1 # # ## ## # # # # / # # # # # # Mk # # # # # Pc # # Pc # # # # # # # # # # r Dc # # # # # # # # # # # # # # # Dc # # # # # # # # ### # # # Df # # # # # # # # # # # # # # L # # a # Dc # # # # # # # Pc o # M # # # # # n Ma # # # # # # (63 # g # # # # # # # # # # / # # # # # # # # # # T76N # # # # d # ## # # # # Df # # Df ## # # # # # # # # # # # a # # # # 7#7 # # ## e # # # # # # # # ####### # # # Ma # ô # # # # # # # # # # # # # ### # ó # # # # # # # ## # Ma # # # # ###### # # ## # # # # # # d # # # # # Pc # # # # # # # # # C # # # # # Sigourney Ma Ma # # 70 # # # # # # # # Msp # # # ô # # # # # # # # # # ó ## ## Pc # # # Pc # # # #### # # # # # # # # # # # # # Pc # # Df # # # # # # # # # # # # # # # # # # # Pc # # # # # Ma # # # ## # # # # # # # # # # # # # # Pc # # Pc ##### # # # # # # # # # # # # # # ## Pc # Msp # # # # # # # # ## # # # # # # # ## # Pc ## # # # # # # # # ## ## # # # ## # # # # # Msp # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # # # # ###M Pc # 92 # # # # # # # # ## # # # # # # # # # # # # ô # # # # # ## # ó # 92 # # # # # # # # u # # ## # # ô # # 923 Df # # # # # # # # # # ó # # # # # # # # 92 # ø # # ÷ # # # # #c # # # Msp ô # # # ó # # # # h # # # # # # # # # # # # # # # # # # # # # # # a S # # Pc # # # # Pc # # 305 # # # # # # # # # # # # # # # # # ø # # # # # # ÷ # # # k o # # # # # # # # # u # # # Msp Pc # # # Pc # # Pc # # # # # # i # # # # # # # n th # Pc # # # # # # # # # # # o ## # # # # # # # # Dc # # 92 Pc Mk # # # # Df # # # # c # óô# # Ma # # Df # # # # Pc # # # # # k # # # # #92 Mk # # # # # # Pc 163 # óô # # # # # # Df # ø # # # # # # # # # ÷ # # # # # # Ma ## ####### # # Df Mk M # # # # # Dc # # # # # # ###### ## # # Pc Ma # # # # # # # # # # # # # # # # ### Msp # # # i Pc # # # # # Ma # # # # # # # # # o # # # # # ## # # Msp # ### # ## # # # # # # # # # # # # # n Pc # # # # # # p ## S # # # # # # # # # Pc Pc # # # # # # k # # # # # Dc # ### # # k #### Pc # # # # # # # p ## # # u # # # # # e # ## # # # # # ## # # # i # # MUSCATINE Pc n # # # # # # ## # # # # ## # # ## # k # # # # # y # # # # ## # # # # # # # # # 92 # # ## # # # # s # # # # # ##### # # # # # # # # ô # # # # # # # # ó # # # # # # # # # # # # # Ma # # # # # #Df # # # # # # Msp Pc # # # # ## s # # # # # # # 92 # Df i # # # # # # ## # # ô ## Dl Dl # ó # # # # Msp # # # # # ## # # s # # # # # # C # # # # # Pc Msp Ma # # #### # T75N # # 92 # # # # # # Ma # # # s ô # # # # # # # r ó # # # 371 # # # # # # # ## # i ## # # ÷ø ### # # Pc 149 # Ma # # 92 e # # # # # # # # ô# # # # # ó ø # # Pc ÷ # e # ## # # # # # # # # # # # # # # # # # # # # # # # ## M # ####### # # # # # # # # # # # # # # # # k # # # # # R # # ## # # # # # # # # Pc # Msp # Washington # # # # ## # # # # # # # # i # # # # # # # ## # # # # # v # ## # # Pc # # # # # # Msp e #### # # ### # # # # Df # # ## # # 2 1 # ## # # # # # # Pc # Ma # # # # ô r # # 1 # # Ma # # 70 # # # WASHINGTON Msp ó # # # # # # # # Msp ô # # # # ó # # # T75N # # óô # # # # # # # ### # # # # # Mk Ma Dc # # # # Pc # # Msp Pc # # # # # # # ## # # ## ## # # # # #### # # # # # # # # # # # # # Pc Msp # # ## # # # MAHASKA # KEOKUK # # ### ## # # #### # # # # # # # ## # # # # # # # # # # # # # # # # # # # # # # Df # # # # # # # Pc # # # # # # Df # ### ## # # S Pc Pc # # # # Pc# # # # # # # Dl # # # #### # # # # ## # # # # # # # ## Msp ## O#skaloosa Ma ## # # # # # # ### # ### # # # # # # # # # # # # # # # # # # Msp # k # Ma # Run # # # # ## ## # # # # # Pc # Msp # # # # # # # # # # # # Msp u # # ## # # # # Df # # # Msp # # # # # # # # # n Msp # ### # # # # # # # # # ## # # # # ## Pc # # # # R02W # # ## # Pc # # # # # # ## # # # # C # # # # Msp # # # # # # Pc # # k ## ## # # Dc # # # # # # River # # ### # Pc ## # # ## # # r # Pc # # # # # # # # # # # # # # # Msp # # # ## # # # # # e# # # # # # Dc # ## ## # # # # Ma # # C # # # # # # ## ## # # # Msp # # # ## # # e # # # # # # # # ## # # # # # # # Ma # # # r # (61 # # ## # # # / # # Msp # # e # ### # ## # # k # # # # # # # # # ## ## # # (63 # e # # # # # # # Pc / # # # # # # # # # # # # # # # # # # # # # # # Pc # # # k # # # # # # # ### # # Pc # ## # # # Ma # Dl # ## # # # # # # # ## # # Pc # # # S # # # # # Msp # # k # # # # ## Dl # ### # # # # # # # # # ## # # # # 21 # # # # # # # # # # # Msp u # # # # (8 Pc ## # # # # # # Ma # / # # # # # Pc # Msp n # # Df ## # k # Pc # # # # # # # # # # # ## ##### Pc # # # # # # # # # ## # # # # # # # # # # # # # D # # Pc # # # #### # # # # # ## # # # # ## # ### # # ## # # # # # # # # # # ## #### # # # ## # T74N ### e # # # # Pc Pc M#sp # # # # # # ## # # # # # Msp # # # Ma # # # # # # # # ## # # s # # Ma # # # # # # # Df # # # # # # Msp # # # Pc ###### # ## # ## # # # # # # # # # # # # # # ### # M # # # # # # # # # # # # ## LOUISA # # ## # # Pc Msp ## # # # # ## # # # # # # # # # # # # # # # # # # # # ## # # ## Df # ## # # o # # ## # # Msp Ma ## # # # # ## # # # # ## ### # ##### # # # # # # # # # # # ## # i # # # Pc ## # ### # # # # # # # # ####### # # # # # # # n # # # 149 # # ## # # # # # # # ## # ## # # ## # ø # # # # # # # # # ÷ # # # # # # # # # e # Pc # # # # # ## # # # Ma Pc Msp # # # # # # # # # # # # # # # s # # # # # # # # Dc Dl # ## # # Msp # # Msp # # # # # # # ## # # # # # # # ## # # # # 91°00' ## ##### # # # # # # # # # # # # # # # ## # # # # # # # # # ## # # # # ## # # ### ## # # # # Msp ## Ma # # # # # ## # # # #### # # # # 1 # ### # # # # # # ## # # # # # 2 1 óô # ### # # # # # # # Pc Pc Pc ô # ### # # # ## ó # Msp # # # # # # # # # # # 99 # # # # # # ## # # # # Msp # Pc # Dl Dl ô # # ó # ## # # # Msp # # ## # ## # ## # # # # # # # # # # # ### # ### # # # # # # # ## # T74N # # Pc Pc # # # # # # # # # # # # # # # # # # # # Ma # # # # # # # # # Msp # # # R01W ## # # # # # # # # # # # # # # ## # ### ## # # # Pc # # # # # # Dc ## # ## # # # 78 # # # # # # # # # # ### ## ## # # # # 78 ô # # # # # ó # # # # ## ## # # # # # ô # # Df # # # # ó # # # # # # Wapello # # # # # ## 149 # # # # # # # ## # # # 149 ÷ø Msp Df # # # # # # # # Pc ø # # # # ÷ # Msp # # # ### # # # # # # # # Pc # # # # # # # # ######## # ## # Ma # Pc # # # ## # # # # # Pc Pc # # # # Pc Msp Msp ## # # # # # ## # # # # # # # # ### #### # Pc # # 78 # # # # # # ##### # # Pc # # # óô # # # # # # # # # # # Pc # # ## # # # # # # # Ma # # # # # # # # Msp Msp # # # # # # # # 1 # # # # # # Df # # # # # óô # Msp # # # # # # # # Pc Msp # Df # # # # # # # # # # # Dc # # # # # # # # ## # # # # # # # # ## # # # # # # # # # # # # # # # # # ## # Pc # ### # # # # #### # # # # # # # # # # Msp # # # # #### # # # # ## Pc # # # # # # # HENRY # JEFFERSON HENRY ## ## 78 # ## # # # ## ## ô # # # # ó # # # JEFFERSON # # # # # # # # Msp # # # # # # # # WAPELL#O # # # ## # # # Pc # Pc # # # # # # Df # # # ### # # # # ## # # # # # R17W R16W # # # # #### # Mk # # ## WAPELLO # # # # # # # # # # ## # ## # # ## # Msp # # # # # # # # # # # ## # # # # # # # Pc # # # # # # # # # # # # # # # # # # # # # # # # # R # # # # # # # # # # # # # # # Dc # T73N # # # # # # # Pc # # # Ma 249 # ## # # ø # # # # # # # ÷ # # # # # # # # # # # # # # # # i Msp # # # # # # # # # # # v # # # # # # # # ## # Msp # # # # # # # # # # # # # # 78 # ## # # # # # # Ma ô # ### # e ó # # # Msp # # # # # # # Ma # # # # # # # # # # # # # # Pc Ma # r Msp # # # DES MOINES # ## Ma Ma # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # (63 # # # # # # ## Pc / # # # # # # # # # # Pc # # # # # ## # # # # Dc # # # # # # # ## # # # ### # # # # Df # # # # # # # # # # # # # # # # # # Ma Msp # # # Ma # # ## # T73N Pc # # # Ma # # # # # # # # ## # # # # # # # # # ### # ## C # # # # # # # # ## e # Ma # # # # # ## # # d # Pc # 1 # # # # # # 78 # # # # # 389 a Pc óô Msp Msp óô # # # # # # # 23 ø r # # Msp # # # ÷ # # # # # óô # # # # # 99 # # ## # # Pc # # # ô # # # Ma ó ## ## # # Df # # # Pc Msp # # # # # # # # # # # # # # # # # # # # # # # # # # # ## # # # # # Msp # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # # Pc # # Msp # # # # # # ## # # # Msp # # # ## # # # # # # ## # # # # # # # # # # # # # ## # # # # Mk # # # (61 Ma Dl # # # / # # # # # # # # # # # # # # # # # # Msp # # # # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # ### # # # # # # # Df # # # # # # Msp # # # # # # # ## # # # # # # ## DES MOINES # # Pc # # # # # # # # # # # # # # # # e # # # # # # # Ma # # # # # # #### # # # # # # Msp # y # # # ## # # # # # # # Pc # # # e ## # # # # # Ma # # k # # # # # # # # # Msp # # # Pc Msp 21 # Ma Ma w # # # # # # # (8 # # # # # / # # ## # # # # a ## # # # # # # # VAN BUREN # # ## # Pc # Pc # # # # # # # # # # # Msp # # # # H # DAVIS # # # # # # # # # # # # # # Msp # # # # # # ## # # # # # # # # # ## # # # # Pc # # ## # # ## # # # # # Msp # # Creek T72N # # # # # # # # # # # Pc Msp # # # Msp # # # # # # # # Mk # # # # # # Msp Msp # # Ma # # # # # # # # # # # # # Ma # # # # Ma # # # # # # # # # # # # # # # # # # # # # # Ma # # # # # # # # # # # # # # # # # Ma # # # # # ## # # # #### # # # # # Pc ## Pc # # # # # # # # # # # # # # # # # # # # # # # LEE # # Msp # Pc # # # Ma # # # # # # # # # # # # # # # # # ###### # Ma # # # # # Pc # # # # ## # # # # ## # # # # # # # # # # ### # # # Pc # # # # # # # # # Msp # # Ma # # # # # # Pc # # # C # Ma # # # # # # # ## # # # # # # # re # # # # # # # # ## # # T72N # e # # Mk # # # # # 41°00' # # ## # # # # k # # Ma # Mk # # # # # # # # # # # # # # # # # # # # 34 # # # # # # # # # # # # # /( # # # # Df # ## ## # # # Msp # # # Y # r ## # # # # # # # # # # # # # # # # (34 ## # ## # # e # # / # ## # # ## ## # # # # # # # # # # # # l Df ## e # # # ## # # # # # # # l # # # ### # # # # # # # # Ma # # # # # # o Ma ## # # # # # # # # # w v # # # # # # # # # # # # i # ## # # # ## (34 # # # # # ## # #### # 34 / # # # # # # ## ## # # # ( # # # # # # # # # / # # # 41°00' # # # # # # # # # # # ## ## # # ## # # R # # # # # # Ma Pc # # # # # # # ## # # O#ttum# wa # # # # # # # # # # # # # # # # # # # # # # # # # # # # Pc # # Df # # # # # # # # # # # # # # # # # # # # Msp # # # Ma # # # # Pc Df S # ## # # # # # # # # # # Mk # # # # p # # # # # # Mount r # # # # # # # # Ma # # Df # Msp # # # # # # # # in # ### # # # Ma # Df # # 958 Fairfield ### # # # g Ma # # # ø # # # #### Msp # # # # ÷ # # # # # # # Df # # # # # # # # # Pleasant C # # # # # # # # r # # # # # # # # # # # ## # # # e Ma # # # # # # e # # Ma #### # # # Pc (34 # # # # # # Ma / k # # # ### # # # # # # Ma # # # # # # # # # # # # # # # # # # # # # # # # # # # # # Pc # ## # # Ma # Pc # # 16 # Ma # # # # # # ô# # # # # # # # # ó # # # # # ## # # # # # # # # # # # # # # Mk # # Df # # # # # Pc # # # # # # # # # # # # Msp # # Msp # # # # # # # # # # T71N # # Msp # # # # # # # # # # # # # # # # # # Msp # # Ma # #

## # k # Mk # R # # # # Ma #

# # h # i Msp Msp # # F # # # # rt v e # # # # # # o # e # # # Mk # l Msp N S r Pc # # # # # in

# o# # # # # e t a # # # # # # # #

p # # # # # # r # # # Pc # # # Msp # (34 # # # # # # / # # # # # # # # # ## # #

# # 63 # # # # # ( C # # / Pc # # # # # # # # # # # # Msp # Df # M#a # # # # # # Ma # # ## # # # T71N # # Pc # # # C # # # # Pc # # Pc # # Df # # ### # # # # # # # ##### # # # # # # # # # Msp # # r Df # # # # # # # e # Pc # Msp # # # Ma ## # Pc # # Pc # Ma # # # # # # # # # # e # Pc # # # # # C # # Pc ## # (61 k # # # / # r # # ## ## e Pc # # # # # # e # # # # # # # # k # # # # # # # # R01W # # # # # # ## # # # # # # # # # # # # # # # # Ma # ## # # # # # # # # # ## C # # # # Ma # # e # # # # # d a # # # # ## # ###### r # # # Ma # # # # ## Msp # Ma # 91°00' Ma # # # # # # # Msp # # Msp# # # # Pc ### # Msp # ### # # 1 ## # # # # # óô # # # P# c Msp ## # # # # VAN BUREN # # # # # Pc # # # # # # Bedrock Exposures in Southeast Iowa # Pc # Msp Df # # # # # # # # DAVIS Pc # Ma # # # # # # # # Ma # # C # # # Ma # ## # # # r # # # # # e # # 99 Pc # # S # # e # # ô # ó# # # # Dkf # # Pc # # p C Pc # # k Ma # # # Pc a # # # # # o # r ### Pc # u # # # ## e # # # # # # S e # n Msp # # # k # # Msp ## Msp # # # # Ma # Ma # Df # # # # ## # Msp k # # # # # # # # # # # # ### # # # # # # # # ## Pc # # # # # # # # # # # # # # ## # # # Msp # 16 Pc # # # # Msp # Pc # Pc óô # # # Ma # # # # # # # # # # Ma Pc # # Msp # i # Msp # # # # # # # Ma T70N Msp Ma # Pc # Ma # # # # ## # p T70N 9# 8 # # # # # ## # # # # óô Ms# p# # # # # # # # Ma p # # # # # # # # # # # # i # # # Msp # # # # # # # # # # # (34 # # # # s # / # # # 79 # th # # óô # # # # # s ou # # S # # # # # # # i C # # # # # h # Pc # # # # # # s eq # # ## Ma # # u # # # # # e # # Pc # # # # # 406 s st # # # ø # i ÷ # Ma # Msp # # # Pc Pc # # # # # # # # # # Msp # # ## # # Msp # # # # #### M # # # # (63 # # # # # # # # # / # # # # 16 # # # # Pc # # # ô # # # # # # ó # # # # # 218 Ma # # ( # Msp # /# Msp # # # Msp # # # # # # Msp # Ma # Pc # # Msp # # # # # # # # # # # # # # # Pc Msp # # # # # # Pc Pc # # # Pc # # # # # # # # # # # # C # # # # # # # # # # # # Msp # # # # # # 273 r # # # # # Burlington ÷ø e # Msp # # # # # # # LEGEND e # # # # # # # # # ## Ma # # # # # # # # # # k Pc Pc # # # # # # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # Ma (6# 1 # 16 # # /# # Pc # # # ô # # # # # # # # Pc ó # # # # Pc # # # # # # Pc # # Msp # # # # # # # # # Msp # # # # # ## # # ## Pc # # # # # # # # #### # Msp # # Pc # # # # # # # # # # # Pc # # # # # Ma # # Mk # # # # # ## # # # Pc LEE# # # # # # # # Msp # # # # # # # # # # # # # T69N # # # # R PENNSYLVANIAN # # # # # i # Pc # # # # v # # # # # e# # # Bloomfield # # # # # # r # Ma # # # Pc # # # # Msp Msp # # # # # # # # # # # # # # # # # # Ma # # # Ma # # # # # # # # # # Msp # # # ## # #### # Pc # # # # ## # # # T69N # # # # # # # # # # # # Pc Msp Marmaton Group. Upper Middle Pennsylvanian (upper Desmoinesian). Maximum thickness estimated 75 ft (23 m) in southwest Davis Co. Primary lithologies: shale, light to dark gray; limestone. Msp # S # Ma # # # # Msp # # Msp # # Pm # # # # # u # ## # # # # # # # # # # # # # # # # # # # Msp g # # # # # Msp 16 Mk # # # Keosauqua # a óô # # # # # Pc ### # # Pc # Df # # # ### # # # # r # # # # # # # # # # # # # # # # ## # # ## # # # # # # # # ## # # Pc ## # # # # # # # # # # # # Pc # # # # Pc Ma # # # # # # # # # ## # # # # Ma Df Cherokee Group and Caseyville Fm. Lower and Middle Pennsylvanian (Morrowan, Atokan-Desmoinesian). Includes Kilbourn, Kalo, Floris, Swede Hollow, Spoon fms.; Caseyville Fm primarily in Pc # ## # # # # # # # Pc # # # # # # # # # # # # # # # # # # # # # # # # Msp Pc # # # # # # # # # # # # # # # # # Pc # ## # # # # # # # # # # # # # # ##### # Ma # # # # # # # ## # # # # # # # Muscatine Co. Maximum thickness to 412 ft (126 m) Wapello Co., 230 ft (70 m) Muscatine Co. Primary lithologies: shale, gray, part silty to sandy; , vf-m. Secondary lithologies: shale, # # ###### # # # 103 # # ## Msp # # # S ø # # # # ÷ 2 # # # # # # # # # # ô# # u # # # # ó # D # # # # # # # # # # # # # # g Ma # # Ma # # # B # e # # # # # # # # black; mudstone, gray to red; coal. Minor: limestone; coarse sandstone; siderite, pyrite. # a # # # # # # # # Msp # r # # # # # # # # # i # # s # # # ## # g # # # # Pc # Ma # # Pc # # # # # # # # # ## # # # # ## # # Msp # # # # ## # # # # # # # # # # # Ma # # # ## # # # # # # # ## # # # # # # 1 # # # # # # ô # # ó # Df # # Msp # # Pc # Msp # # # Msp # # # # # T68N 2 # # ô # # Msp # ó # # # # # # # # # # # # # MISSISSIPPIAN # Msp # Moines # # # # # # # # # # # Df # # # # # # # # # # # # # # # # # # # # # Pc # # # # # # # # # # # # # # # Pc Pc # # # # # # # Msp # Pc ## # # # # # # # # # # # # # T68N # # # # # # # # # # # # # # # # “St Louis” and Pella formations. Middle Mississippian (Meramecian). Locally includes Sonora Fm in Lee, Van Buren, Henry, Des Moines, and Jefferson counties. Maximum thicknesses vary 45- # Pc # # # # 10# 3 # Pc 2 I # Pc # # # # # ø Mk # ÷ ô # # # # ó # # # # n # # # ## # # # Pc # # # # # # # # (61# Mk d # # # / Msp Pc # Pc # # # # # # # # # ## 130 ft (14-40 m); beveled to truncated beneath sub-Pennsylvanian . Primary lithologies: dolomite, part sandy to fossiliferous; limestone, part sandy to fossiliferous; dolomite/limestone # i # # # # # a # # Mk # # # Pc # # n # Ma # # # # # # # # # # # # # Ma # # # # # Pc # # # R02W # # ## # # # # # # # Ma Df # # # # Ma breccia; sandstone; shale, green-gray to pink. Secondary lithologies: oolitic limestone; gray shale. Minor: chert, chalcedony, anhydrite. # # # # # # # # # # # # # # # # # # # # # # # Msp # ## # # # # # # # # # Pc # # ## # # # # (63 # # # # # # ## # # / # ## # # # # ## # # # # # # # # # # # Msp Pc Msp # # # # # # # # # # # # # # # # # # # ## # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ## # # # # # # # Msp # # # # # # Msp # # # r # # # # # # # # F#o## rt Madis#on # 2 # #2 e # óô# # # # # # # óô # # iv Augusta G roup. Middle Mississippian (Osagean); upper Warsaw in Lee and Van Buren counties likely ranges into basal Meramecian. Includes Burlington, Keokuk, Warsaw fms. Maximum thickness # # # # # # # # Pc # # R # # # # # # # Ma # # # # # # # # # # ## # ### # # R03W C # # # Mk ## # 200 ft (60 m); locally beveled beneath sub-St. Louis and sub-Pennsylvanian . Primary lithologies: dolomite, part argillaceous; fossiliferous limestone (especially crinoidal packstone). # # r # # # # # # e Ma # # # # ek # # Ma # Pc # # # # # 15 # 8 1 Msp # óô # Msp óô # # # # C Secondary lithologies: glauconitic limestone and dolomite; chert, nodular to bedded; shale, gray to green-gray, part silty. Minor: quartz geodes, chalcedony, silicification, siltstone, phosphatic limestone. Pc # # r # # e # # # e (61 # / Pc # # k # # Pc # Msp # # # # # Pc # # # # # # # # # Pc ### R04W # (218 ## / # # # # # Pc # # # ## # Pc # Df # Ma # # T67N Pm R08W # # # # # Kinderhookian strata. Lower Mississippian (Kinderhookian). Includes Wassonville, Maynes Creek, Prospect Hill, and “McCraney” fms.; thin Gilmore City Fm (upper Kinderhookian-basal Osagean) # # # Msp Pc T67N Pm # # # # # # Mk R09W R # # Ma # ## ive Mk # r # # # Ma locally present in Mahaska, Jasper, P oweshiek counties. Maximum thickness 130 ft (40 m) in Lee Co. Primary lithologies: dolomite, part fossiliferous; mixed dolomite/limestone; siltstone, R10W Mk # # # Pc # # Ma # T67N # # # 92°00' # # # R11W # R12W # ## # # argillaceous. Secondary lithologies: shale, gray to green-gray; fossiliferous limestone, oolitic limestone. Minor: chert. R15W R14W R13W # Msp # # # # # # # ## # # # # 92°00' # Ma C # # Pc re # # ek Pc # # # # # # # ## # # # # # # # # # Msp # # ## # # # # Mk # 394# # # ø # # # # # # # # ÷# # Famennian interval. Upper Devonian (Famennian). Includes Sheffield, Maple Mill, English River, Saverton, Grassy Creek fms.; upper New Albany and Yellow Spring groups; likely includes # # # # # # # 404# # # # # ÷ø Dk # # # # # T66N # # # Louisiana Fm in southern Lee Co. Maximum thickness 300 ft (90 m). Primary lithologies: gray to green-gray silty shale; laminated brown to brown-black shale; siltstone, argillaceous, part # # # # Pc Ma # # # # # # T66N fossiliferous. Minor: phosphatic siltstone; oolitic ironstone; limestone. Msp Df # # # ## # ## Index Showing Area of Geologic Map # # # # # # # # # # # # # Mk # # # # # # # 40°30' # # # 0 5 10 15 20 25 Miles # # # # 40°30' # # # # # ## # # # Lime Creek and Sweetland Creek formations. Upper Devonian (upper ). Includes “Amana beds” of Iowa Co. Maximum thickness 160 ft (49 m) in Poweshiek Co.; Sweetland Creek Shale # # # # # # # # # # # # Dl # # # # # # Prepared under the STATEMAP program, in cooperation with the <20 ft (6 m) in Louisa, Muscatine counties. Primary lithologies: gray to green-gray shale, part calcareous to dolomitic. Secondary lithologies: argillaceous dolomite/limestone, part fossiliferous. R07W # # i # Mk # # # # p # # # # # # # # # Ma ## Ma # # # # p Minor: siltstone; brown shale; phosphatic siltstone/shale. # # i # # # # # # # # # s U.S. Geological Survey, Department of Interior, Supported by # # # # s # i 0 5 10 15 20 25 30 35 40 Kilometers # # # # # # # s # # # s # Msp i # # # # # Cooperative Agreement 03-HQAG-0087 Cedar Valley Group. Upper Middle and lower Upper Devonian (upper -lower Frasnian). Includes Little Cedar, Coralville, Lithograph City fms. Maximum thickness >200 ft (60 m) # ## # M # # Dc Df # # # # # # # # # # scale # ## 6#1 # Poweshiek Co.; 80-130 ft (24-40 m) southeastward. P rimary lithologies: limestone, fossiliferous, locally biostromal, part argillaceous. Secondary lithologies: sublithographic to intraclastic limestone; # /(# ## #

dolomite, part argillaceous. Minor: shale, sandy limestone, chert, silicification. # # # # T65N T65N # # # # ## ## # # # # # # # # Wapsipinicon G roup. Middle Devonian (-lower Givetian). Includes Otis, Pinicon Ridge fms. Maximum thickness 100 ft (30 m). Primary lithologies: limestone breccia; laminated dolomite; Mk # # # # # # Dw # # # # ## # # # argillaceous to sandy dolomite. Secondary lithologies: sublithographic to intraclastic limestone, part laminated; fossiliferous dolomite to limestone; gray shale, part sandy. Minor: oolitic limestone; # # # # # # # # # # #

chalcedony. # # # # R06W Ma SILURIAN Geologic Contact County Line 91°30' R05W Sg Gow er Formation. Silurian (Wenlock). Maximum thickness 75 ft (23 m). Primary lithology: laminated dolomite. Secondary lithologies: fossiliferous dolomite (brachiopodal or crinoidal); dolomite mudstone;. Minor: chert, intraclastic dolomite. Fault Zone Township Boundary u u = up-thrown block Scotch G rove Formation. Lower Silurian (upper Llandovery-lower Wenlock). Maximum thickness 190 ft (58 m). P rimary lithologies: porous fossiliferous dolomite (crinoidal); cherty to very cherty Ss d d = down-thrown block dense dolomite. Secondary: mounded dolomite facies, fossiliferous. Minor: quartz druse, silicification. dashed where inferred Major Highways Prepared by the Iowa Department of Natural Resources Sh Hopkinton Formation. Lower Silurian (Llandovery). Maximum thickness 75 ft (23 m). Primary lithologies: dolomite, fossiliferous to vuggy. Secondary: cherty dolomite. Minor: chalcedony, Iowa Geological Survey, September 2004 # Well Data Point silicification. 80 Interstate Open File Map 04-1

River or Creek 34 Federal

2 State