R03W R11W R10W R09W R08W R07W R06W R05W R04W o Ops Ops Ops Ops o Ogp # 92 00' # 43 30' R14W R13W R12W Dw Dw ### # Kw Dw # Kw # o # 43 30' # # # # Ops # ALLAMA# KEE Dc Ogp ### Ops # # # # Dc # # # # # # Dw # # # # # # r WINNESHIEK # # HOWARD e Om # # iv ## # Ops # # # # R # # a ## # # # w # # # Io # Dc r # Ops # e # # # # Ops T100N p # # Ogp # p # # U # Dc # # # # # Ops # # # Om # # # # # ## # Om # # # # # # # # Cjl Cw # # # # Om # # # # Cjl # 52 # # # /( # Ogp # # # # # # # # # # # # # 63 # ( Ogp r # # / # e # # # Ogp # iv # # Dw R Ops Dc Dc # # # # Dw # a ## # w # # o Ops Ops # # I # # # # # r # e # # p # # # # Om# p # Ops U # # # Ogp # # # Ops # Ogp # # # # # # # T99N # Cresco # # # # # # ## # DIGITAL GEOLOGIC MAP OF IOWA # # # # # # # # # # # Ogp # # Dw # # 9 !"9 # # !" # # # # M # # # # IS PHASE 2: NORTHEAST IOWA # # S # Ogp # IS # # # # S Ogp ### # IP # PI # # # R # # IV ## # # # # E # Dc # # # # # R # # # # Ogp # Prepared by # Ogp # # Decora# h Ogp Ops # # # # # # ## # # Dc # # Dw # # # # # # Brian J. Witzke # T # # # Ogp u # # # r Ogp # # k # Dc # # Greg A. Ludvigson # e # # y # # # # # # # # # # # # ## # # # R # # # # # # Dw # # # # i ## # # Robert M. McKay v # # # # # # # # # e # # # T98N # Ogp Kw # Dc r # # # # # # # C # Ogp # # # Ops Raymond R. Anderson # r # 9 ## # a # !" Kw Ogp n # ## # # e # # ## Bill J. Bunker # Waukon C # # # # # Cjl # # r # # # # # e # Om # # e Dc # # # James D. Giglierano # k # Dc # Ogp # # # # # # # John P. Pope # # # Cw # # 9 # Kw # " # # # ! Ogp # Adrian E. Goettemoeller Dc # # # # # # # Ogp # # # # # # # # # # Om Maureen K. Slaughter # # # # # Ogp # Dw Dw # # Dw # # # # # # # # # # # Cjl # # # # # # # T97N # # # # # L Energy and Geological Resources Division W Dc # I Dc Dw # Ogp # i # # t # # # # a t # le # p # # Geological Survey Bureau # # # # s CHICKASAW T Dw # # # # Cjl i # u # # p # r # # # # # i # # k # # # n e # # # # # # i # # y c # # # R Dw # o # # # # # i # August 1998 n # # # v # # # # # # # # Om e # # # R r # # # # # ## # i v # # # # e # ## # L Dc # # Ogp # r 63 # ( # # # i / # # t Dw # # # Produced under the STATEMAP program, in cooperation with the # t # # # l # e # # Ops # # Yel W # # low # # # R U.S. Geological Survey, Department of Interior, Supported by Dw # iv a # 52 # er # # # /( p # # # # 15# 0 # # # # s " # # Ogp ! # i # # assistance Award No. 1434-HQ-97-AG-01719 T96N p # # ### "24 # i Dc ! # # n ## Om # # # Ogp # c Dw # # Dw # o Sls # n # # R # # Cjl # Dc # Om i # # Ogp v Dc Sls # # # # e Om # Om r # Dw # # # # # # # # Sls # Sls # # # # New Hampton Dc # # # # # # # # # # # # # # # # Om ## ## # # # Ogp 18 # FAYETTE # # # ( # # # # # # # / # # # # # # # Ops # # CLAYTON # E Dw # # a # s # t Ogp # # # # B Sls # # # # # # # r Sls # # # # # # # W # # T95N # R # # Ogp # a o # # # p # b # # s e # # # r 18 # i # # ( p / # t i Shb s n # # C # o # i # Shb # # # # # # c # r # # # o e # Om # 43 00' # (18 e # n / # # # k Om o # R i Dw # v # 43 00' e Dc # # # # # # r Shb # # # # Shb # Dw # # # # # # Shb # # # West Union # Sls # # # # # Cjl # # # # # # # # Om ### # # # Shb # (18 # # # / # # # ## # Dc # # # # # # # Om # # Shb # # Om # T94N # # # # # Dw # # # # Iowa Department of Natural Resources # # Dc D#w # Om T # # # # u # Om # rk Sls e # # y # # # # Ri # # # Shb ve # Larry J. Wilson Shb r # Sls # # # # Dw # # # # # # Dw # Shb # # # # # Sls # # # # # # # # # # O# gp # # # ## # # # # ## # # # BREMER # Om Shb /(52 Dc # Om ACKNOWLEDGEMENTS # # # Om Om Shb # # # # Cjl # # # Om # # Om Elkader # Recognized for direct contributions to the map’s production: Donald L. Koch, Jackson L. Gilmore, T93N # Dw # 218 # /( Om # # # # # Lynette S. Seigley, and Orrin W. Plocher of the Iowa DNR Geological Survey Bureau # # # # # # ## ## # # # Shb # # # # # # # Shb Om # # # # # Dw Vo lg # # # a # # # R # # # iv # Om # er # ## # Om # # # # # # 150 Dw !" # # # # # Om # Ogp # # Dw # Om # # # Shb 63 Om # # ( / # # # L C # Dc "13 Shb i ! e Dw t t # # d l # # # e a # # # r # # # W T92N R a i # # v p e # s r # i # Shb Ops C p # ## Dw # r Dw i Om # # # n ## a # # # i Om o n c # # # # e Shb 91 00' o # n Om # C Om # # R r # e Shb Waverly# i # e v # ## k e # r # # Ogp # # # # # # # Om 3 # !"3 !" # # # # # # # # # Om # # Shb # # Ops # Ogp # # 3 # # Shb !" # # Om Dc # # # # # # # Om # # T91N # # # # # # # Om # # M # # IS # B # # SI # # SS # u # IPP # # # I R c Shb Om IVE Shb # Ogp R 218 k # # ( C Dw Dw # / # # # Shb r # # e # # # # # # Shb e # # # # # k # !"3 # # # # # # # # Dc Ss # # # # DUBUQUE # Ss # # # # # # # # Om # # # # # # Dw # # Om # # Dc DELAWARE # # # Shb # # # Shb # # BUCHANAN # # # # # Dw # # Ss # BLACK # # # # # # # # # Dc # Ss # Om # # # r # ## # # # e Om HAWK # # v # # # # i # # R (52 # # / T90N # # a # # t # ## # # # # e # ## # Ss # k O# ps # # # # # # # # o # Om # u # # q # # # # a # # Om # # (63 # # / # # M # # # # # # # # # # # Dc 150 # # # # k # # # " # ### # # ! r # # # Sls # # # o ## # # Om Om # # # # # Dw # F # # # # # # # # # M # # Ss # N Ogp # # Om # a Ss # # # # # # ## Ogp # q # # # # # # ### # u # Shb # # o # # # r # # k # # # e # e # # Shb # # # v # # # Dw # t i # # # a # # # # R # 61 # # ( # / R Ss # Dubuque # # # # ta # # ## # W i # # # # a v e # # o # # p k # # s Sls # e # o # # # i # r # 42 30' p # # Shb u Om # # i Ss # # # # # # n # q # # # # # # # i Manchester Sls # a # # # # c # # # o # # # n # M# # # # # # T89N # # R e # # # i Ss # # l # # # # Shb v # # t # # # e # t # # o # r # i # # # # # # # # I # C # # # # # # # 42 30' # ## # # # L # # # e # # # d # # # # # ## Ogp # # # # # ## # #a # ## ### # # # r # # # Cedar Falls R # # # # # Ss # i # # Dc # # # # # # # # # # # v # Ss # ## # # # # # # e # # Ss # # # # # r # # # # # 20 # # # /( # # # # # ## Waterloo Shb Independence # # # # # ## # # Ss Ss # # # # # Dl ## # # # Shb # # # # 20 # # # # ( # # / # # # # # # # # # # # 20 # # # # # # ( # # # # # # Shb / # # # Sls Ops # Sls # Sls Shb # # Sls # Om (20 # # # / # # # # 20 B # ( # Om # / # # # # # # ## # # # # u # # ## # # # # ## # # ## f ### # # # # f # # ## ## # # # # # # a # # # Sls # ### # # # # # l 13 Ss # # # # # o !" # # # Ogp # # # # # # # Ss # # # # Dl # ## C Ss # # # # # # # # # # # r # # # # # T88N # # # e # # e # # # # # # # # # # # Ops # # k # # # # # # # # # # ### ## # # Sls # # # # # # # # # Ss # # ##### # # # ##### # # # # # # # # # # # # # # # # # # # # # # # # # Ss # # # # # # # Dc # # ## # # # # # # # Dw # # # # # # # D# l 380 # # 218 . # # ## # - # # # , # ( # # / # # # ## # # # ## # # # Ss # # Ogp # # # # # Sls Om # # # # # # # # # # # Om Sls # # # # Dw ## # # 52 # # # # # Ss ( # # # / # # Ss # Dw # # # # Sls Sls # # # # # # 151 # # # ( # / # # # # # # 63 # # # Ss ( # # Om # # / # # # # # # # # # # # # # # # # # # # # # # # # # # ## Ss # # # # Ss # # # # # # # # # # # # # # 61 # # # ( # # # / # Dw Shb # # # # # Ss # # # # Ogp T87N # # # # # Dc # # # # # # ## # # Shb # # Ss # # # # Dc # # # # # # # # # # # # Dw # Ss Ss # Dl Ss # # # # # # # # # # # # # ## # # # # ## # # # # # S# s 150 # Shb # # # # # # # # # # # " # # # ! # # # # # Ss # # # # # # # # # # # # # # # # # # # # Shb # # # # Ss # # # # # # # # # # # # # # # # # Sls # # # # # # # # # # # # # # # # # # # # ## ## # # # JACKSON o # Ss # # # # # # # # # # # # 91 30' # # # # # # # # # R11W # # # # # R13W R12W # # # # R14W # # # # # # # # # # R09W LINN # # R10W JONES # # # # Dc # # # Ss Dw # # # # # # # # # # # # # # ## ## # # # Dw #### # # ### ## # # # # Ss # # # # Ss # # # # # # T86N # # # # # # # # Shb Dc # # # # Ss # # # # Ss # # Ss # # # # Ss # # # # # # # # Ss # # # # # # # # # # # Ss # # # # # # # Ss Dw # # # # # # # # # Ss # # # # # # # # Dw Sg # # # # # # # # # ## # ## # # # # # # # ### # # # Dw # # # # # # # # Ss # # # # Ss # # # # # # # Dw # Dc # # # # # LEGEND # # # # Ss Om Dc ## 151 # # # #( / # # # # Ss # # Ogp # # # # # # # # Ss # # # # Ss # # # # Shb # Sg Dw # # # # # # # # # Ss # # # # # # # # # # # # Dc Dc Sg # # # # Dw # Pcc Ss # # # # # # # # # # # # # # # # # # # # # Pcc # # # # Ss # # # # Description of Map Units # # # # # # # # Shb Ss Ss T85N # # 61 Ss # # # /( Ss # # # # Dw # Dw # # # # # # Dw # Ss C # # # # # Ss Ss # # Sg Dw # # Ss 52 e # # /( # Sg # # # d # # # # Sg # # # # Ogp 1# 3 # # # # # a !" # # S# s # Shb # # # r # # # # # # # R # # # # # # # # i # # # v # CRETACEOUS e Sg # # # # # # # # # r Dw # # M # # Ss # # # ## # # # aq # u Ss # Ss # # Ss Dw # # # o # # # # # ke # # # Ss# ta # # # # # R # Ss # # Ss i # # # # Shb # ve # # # WINDROW FM.; Iron Hill and Ostrander mbs.; mid Cretaceous (?upper Albian and/or Cenomanian). # Anamosa r # Dw # # # # # # # ult Zone Kw # # # er Fa # # Pcc Riv # # D Ogp Maximum thickness: 40 ft (12 m). Primary lithologies: sandstone, part pebbly to conglomeratic, part cemented by iron oxides. Secondary lithologies: mudstone; massive iron # Ss # Plum # # # # # # # U # # Ss # # # ore, silty to sandy. # # Shb # # # # # # ## ## # # # # # # # # # # # # # # # # # # # # # # # # Ss # # # ### # # # # # # Ss Sg # # # # Pcc # # Dc Dw # Pcc Om # Om # ## # # Sg # ## # Shb # # # 64 Ss # # # # Sg #### W " # # # # # # ! #.