90°30'00"W 90°27'30"W 90°25'00"W 90°22'30"W R 5 E R 6 E 38°37'30"N D 38°37'30"N 0 e 5 60 e 6 0 r 0 19 20 21 22 23 65 24 600 19 C SURFICIAL MATERIAL GEOLOGIC MAP OF THE KIRKWOOD 7.5' QUADRANGLE Ql r 0 6 Ql 65 50 6 5 0 500 ST. LOUIS AND JEFFERSON COUNTIES, MISSOURI 0 650 0 650 0 Ql k T w 6 5 o m Qa 0 5 i l e 5 C 5 Ql r e e k £67 5 ¤ Frontenac 600 0 LADUE 5 0 50 0 R 650 5 5 5 60 0 5 6 0 0 00 0 6 600 Geology and Digital Compilation by Huntleigh 60 0 0 5 0 600 6 0 0 Ql 0 6 5 6 50 550 0 Bradley A. Mitchell 0 Qa «¬JJ k 6 0 Town and Country 0 0 0 0 5 6 650 0 5 5 5 5 600 5 500 5 600 0 0 0 0 5 R k 0 5 0 6 5 6 5 Pb 0 28 0 0 0 5 Ql 27 6 26 Ql 5 2012 0 0 65 Des Peres 6 0 25 0 0 0 Rock Hill 0 5 6 0 5 5 5 0 0 0 0 0 6 0 6 30 0 30 0 0 Warson Woods 29 0 6 0 6 60 50 5 0 29 0 6 OFM-12-615-GS 5 0 500 0 00 0 6 0 0 5 5 5 5 5 550 Ql 6 0 k 0 Pb Pb 0 5 6 5 5 R 00 R 5Ql 50 0 R 0 5 0 6 0 5 6 5 MISSOURI DEPARTMENT OF NATURAL RESOURCES 0 5 0 6 Ql 0 0 R Pb 0 0 0 5 5 0 5 550 6 6 0 Qa 0 DIVISION OF GEOLOGY AND LAND SURVEY 0 6 0 0 100 5 0 0 0 5 6 ¬ 0 « 0 550 5 6 0 32 R 6 0 0 0 0 GEOLOGICAL SURVEY PROGRAM 0 5 5 34 0 6 Ql 0 0 65 0 0 0 0 0 0 6 5 36 32 5 6 0 0 0 100 6 33 6 5 0 «¬ 5 600 6 35 6 0 0 55 Ql 31 50 0 P.O. BOX 250, ROLLA MO 65402-0250 d 0 0 k n 45 5 5 4 Ql 0 6 a 5 r 50 6 0 G 4 G 0 l 6 a i z e 0 GLENDALE Qa 0 6 www.dnr.mo.gov/geology 4 50 50 0 0 50 60 50 0 5 6 5 0 0 5 5 573-368-2100 650 0 0 0 0 6 5 5 T 45 N 5 5 T 45 N 5 5 0 0 00 55 61 6 T 44 N 0 0 ¤£ T 44 N 5 5 0 60 0 500 0 6 55 5 5 00 0 5 450 0 KIRKWOOD 5 0 6 THIS MAP WAS PRODUCED UNDER A 5 0 R Qa 5 0 650 0 60 6 0 550 5 00 Ql 0 COOPERATIVE AGREEMENT WITH 0 0 0 0 0 Ql 5 5 6 550 55 5 5 0 Ql 38°35'00"N 0 38°35'00"N 60 0 50 0 5 5 5 5 270 6 THE UNITED STATES GEOLOGICAL SURVEY 4 0 6 5 C 0 00 Ql 0 6 0 § 6 0 0 ¨¦ 0 r 3 550 65 0 R e 6 60 e 2 k Qa 650 0 G 60 450 r 0 a 55 0 v 550 5 o 0 500 6 i 55 6 s Pb 650 00 5 600 Permission must be obtained to visit privately owned land 5 55 0 0 5 Oakland 0 5 0 0 0 5 0 0 0 60 50 Ozark View 0 5 00 6 0 0 0 60 50 5 Ql 6 50 50 650 0 5 PHYSIOGRAPHY 00 6 0 00 55 8 R 600 0 45 Qa 5 0 6 5 The Kirkwood quadrangle lies within the Dissected Till Plains Section of the Central Lowland Province of the Interior 5 7 8 Barretts 0 00 5 0 6 0 5 6 5 Plains Physiographic Division. The lowest recorded elevation is 387 feet mean sea level (msl) and occurs within the 0 5 5 00 k 0 0 Osage Hills 5 0 C 5 60 0 5 Ql 00 R 9 6 6 r Woodbine Heights e Meramec River valley in the southeast of the quadrangle. The highest elevation on the quadrangle occurs in the loess 600 0 6 600 65 0 e 12 600 0 Ql k 600 11 0 covered uplands near the northern boundary of the quadrangle and is greater than 680 feet msl. Total relief on the 5 Keyes Summit 5 55 10 0 Pb ¨¦§44 Windsor Springs 650 Ql Kirkwood quadrangle is approximately 300 feet. 0 Twin Oaks R 5 4 500 5 0 50 5 6 500 0 Meacham Park R 5 550 500 6 7 00 0 Ql 6 141 5 0 6 «¬ R 55 k Qtd 450 GEOLOGICAL OVERVIEW 0 8 5 0 4 50 5 0 6 600 5 0 0 5 0 0 5 4 40 R Crestwood 0 E 500 0 V Qa R I 50 The Kirkwood quadrangle is underlain primarily by deposits of Paleozoic limestone and shale. The upland area in the 4 5 0 0 5 0 0 5 18 5 6 Valley Park «¬366 northeast of the quadrangle has exposures of Pennsylvanian-age Cherokee and Marmaton Groups which are cyclic 0 45 R 600 16 Pb R Desmoinesian Series deposits of shale, limestone, sandstone and coal. The Mississippian-age St. Louis, Salem, and C 0 Pb M E 50 650 R A M E Warsaw Formations underlie much of the southwest of the quadrangle except for areas where the Meramec River and 0 15 50 13 k Qtd 50 5 0 its tributaries have incised into the Mississippian-age Burlington-Keokuk Formation. F 0 14 18 5 ish 40 5 po Qtd Qa Pb t C 0 r 5 17 6 6 Pb 00 600 6 0 0 17 4 Ql 00 00 A' 5 4 00 Qa 0 DESCRIPTION OF MAP UNITS 50 Pb 5 Qtd Qtd 4 5 R 0 0 50 Qa Qa 5 0 R 50 50 5 0 ¤£ 0 6 ¨¦§44 QUATERNARY SILT-CAPPED ALLUVIUM – This unit has been deposited by the Meramec River and its tributaries. 6 38°32'30"N 50 38°32'30"N Qslt Pb R Sappington The approximate upper 15 feet of these deposits are composed predominantly of silt with variable amounts of clay Peerless Park 0 5 450 5 0 Qa 5 Ql 5 Sunset Hills and organic material. The material residing below the silt is predominantly sand and gravel to the top of bedrock. Qa 0 k 5 6 4 5 0 5 500 5 5 55 0 0 0 21 0 The thickness of this unit ranges from less than 10 feet where the floodplain transitions to uplands to more than 100 20 550 22 24 0 23 450 60 0 550 0 feet where the Meramec River has incised the Paleozoic bedrock. The water table is approximately 10 to 30 feet 0 0 6 20 0 0 6 5 5 0 0 0 Pb 55 0 0 5 0 5 5 19 below ground surface, resulting in an interval of saturated sand and gravel more than 50 feet thick. This unit is R 5 0 R Qtd 0 5 50 0 5 R 500 0 0 included in the cross sections as Quaternary silt-capped alluvium. 0 5 4 5 0 550 65 0 0 5 R 4 270 § 550 5 ¨¦ 5 QUATERNARY LOESS – This unit is a wind-blown deposit of silt and clayey silt with occasional pockets of clay, 0 5 Ql 00 6 500 0 5 Qtd sand and gravel. The unit is composed of two separate loess layers, the Roxana below and the Peoria above 0 0 R 0 6 5 50 50 0 4 55 5 27 26 (Goodfield, 1965). The total thickness of the two units may reach 100 feet. The Roxana is higher in clay content and 0 29 0 5 65 26 5 0 6 0 may have a paleosol developed in the upper few feet. The contact between the two units forms a potential slide plane 0 5 5 30 50 00 28 5 6 0 0 00 Pb 0 45 in areas of high topographic relief. The loess overlies Pennsylvanian-age bedrock comprised of limestone and shale A 5 25 6 0 5 0 0 0 Ql 30 55 550 141 R 0 29 creating two unique environments. Where the loess is thin, the limestone may be karstic. Where the underlying unit R «¬ 60 550 30 6 Qa «¬ 0 5 is predominantly shale, water will perch, destabilizing the contact zone. Where the loess rests upon shale, the slide 0 50 4 Qa 5 potential is increased. 5 0 k 0 00 5 0 6 R 0 550 6 500 50 Qa 5 60 27 500 0 QUATERNARY TERRACE DEPOSIT – The terrace deposits in the quadrangle are slightly different than previously 5 4 k 0 5 5 0 0 0 Qtd 6 Qtd 0 Pb R 60 mapped terrace deposits (Brill, 1991; Harrison, 1997; and Goodfield, 1965).